The average amino acid length of proteins in Escherichia coli is 235. Therefore, according to the video, the elongation time for an average E. coli protein would be about _______seconds.
How is the small ribosomal unit positioned to allow for translation to start at the proper start codon?Choose one:
A. Shine-Dalgarno sequence
B. The start codon sequence is specifically attracted to the P site.
C. Initiation factors position the mRNA accordingly.
D. The small ribosomal subunit starts at the far 5' end of mRNA where the start codon is located.

Answers

Answer 1

Answer:

approximately 15 seconds

A. Shine-Dalgarno sequence

Explanation:

In Escherichia coli, it has been shown that the translation elongation rate is approximately 16 amino acids per ribosome per second (16 x 15 = 240). On the other hand, the Shine-Dalgarno sequence is a polypurine stretch of variable length present in prokaryotic cells and acts as a ribosomal binding site for the messenger RNA (mRNA). This sequence can base-pair to a complementary sequence known as the 'anti-Shine-Dalgarno sequence' at the 3' end of the bacterial 16S rRNA subunit and is required to initiate the process of translation by which a polypeptide chain is synthesized. Generally, the Shine-Dalgarno sequence is located from 10 to 8 nucleotides upstream of the start codon (AUG codon). In E. coli, the Shine-Dalgarno sequence is AGGAGGU.


Related Questions

Name this tube like cavity? I think it’s the Esophagus.

Answers

Answer:

esophagus

Explanation:

your answer is right

Answer:

esophagus,

Explanation:

You are correct in your original answer.

1. Suppose you want to design and build a house. How would you communicate your design plans with the construction crew that would work on the house?
2. Cells build large, complicated molecules, such as proteins. What do you think cells use as their "design plans" for proteins?

Answers

Answer:

The correct answer is -

1. blueprints.

2. cells use DNA as their design plans

Explanation:

Blueprint is a representative drawing of an engineering plan that helps in understanding how and where the desired to construct on the house. It helps in communicating what work should be done in the house. It helps in visualizing how the end product should be.

In cells, the design plan is DNA that encodes all the information in a specific nitrogenous base sequence in order to produce specific functions and produce all the proteins

name a disorder that is a result of shortage of proteins in children ​

Answers

Answer:

A disorder that is a result of shortage of proteins in children is Kwashiorkor

Explanation:

Kwashiorkor is a severe form of malnutrition. It's most common in some developing regions where babies and children do not get enough protein or other essential nutrients in their diet. The main sign of kwashiorkor is too much fluid in the body's tissues, which causes swelling under the skin (oedema). (Source: Kwashiorkor - NHS)

Hopefully this helps.

Kwashiorkor is a serious condition that can happen when a person does not consume enough protein. Severe protein deficiency can lead to fluid retention, which can make the stomach look bloated.

Kwashiorkor is most common in children, especially if they do not have access to adequate nutrition soon after they stop breastfeeding. If a child experiences kwashiorkor, they need immediate medical attention.

Other terms for kwashiorkor include:

protein malnutrition

malignant malnutrition

protein-calorie malnutrition

In this article, we look at the causes

the hawaiian islands were formed by volcanic activity, but they are far from any plate boundaries. explain how this could occur.

Answers

Answer:

Hotspots from under the ground

Explanation:

There are three different situations where an volcano can form. A divergent boundary, where two tectonic plates move away from each other, subduction boundary, where one of the tectonic plates moves under the other, and a hotspot. Scientists are not completely sure how hotspots form.

What is postharvest handling?​

Answers

Explanation:

In agriculture, postharvest handling is the stage of crop production immediately following harvest, including cooling, cleaning, sorting and packing. The instant a crop is removed from the ground, or separated from its parent plant, it begins to deteriorate.

Is it important for an electrician to know the right tool for the job?​

Answers

Answer:

Yes

Explanation:

It is important because if he does not know, he may be hammering a nail with a wrench. That may break the wall itself.

Answer:

Yes definitely

Explanation:

if they dont have the right tool something can go wrong

which body system makes red blood cells?

A. single celled
B. multi celled
C. plant cell
D. animal cell
E. tissue
F. respiratory
G. transport system
H. nervous
I. digestive
J. muscular
K. skeletal
L. circulatory
M. cells
N. specialized
O. nutrients
P. grow
Q. respire

Answers

Answer:

In the human adult, the bone marrow produces all of the red blood cells, 60–70 percent of the white cells (i.e., the granulocytes), and all of the platelets. The lymphatic tissues, particularly the thymus, the spleen, and the lymph nodes, produce the lymphocytes (comprising 20–30 percent of the white cells).

Answer:

E

Explanation:

Red blood cells, most white blood cells, and platelets are produced in the bone marrow, the soft fatty tissue inside bone cavities. Two types of white blood cells, T and B cells (lymphocytes), are also produced in the lymph nodes and spleen, and T cells are produced and mature in the thymus gland.

All of the different organisms interacting in a pond make up:
A) a community
B) a population
C) the water cycle
D) the habitat

Answers

D or A because a habitat is made of different things and so does a community

Answer:

Hi, there your answer is a community

Explanation:

which water pollutants can lead to excessive growth of water weeds​

Answers

Answer:             Water pollution also affects the ecosystem – it can cause a phenomenon called eutrophication. This can cause fish and other aquatic organisms to die. Toxic elements dissolved in water can make their way to humans through fish or other aquatic organisms.

https://byjus.com/biology/effects-of-water-pollution/

Explanation:

Answer:

Excessive nutrients (nitrates) from fertilisers are flushed from the land into rivers by rainwater. Oxygen levels reach such a low point that fish and other organisms suffocate. These nutrients cause increased aquatic plant growth of algae and other plants.

Explanation:

Describe the metabolic pathways in the monarch butterfly that take advantage of milkweed nectar to convert it into an energy currency.

Answers

Answer:

Metabolic pathways in monarch butterflies are as follows:

GlycolysisKreb's cycleOxidative phosphorylation

Explanation:

They convert sugar which they obtain from nectar into fats that they store as source of energy. Monarch have a little layer of fatty tissues which aid in conversion of Sugar in to fat.

They consume the stored fat during reproduction. A lot of fat is eventually converted to eggs and some of it is used to provide energy just to sustain the reproductive butterflies.

During winter season, when their metabolic is low they consume energy by converting stored fat into sugar called Trehalose.  The conversion of fat also releases little water which help them to survive during winter.

1) Glycolysis:

Glucose is phosphorylated by hexokinase enzyme to give glucose-6phosphate. This glucose-6-phosphate enters into glycolysis and is broken down into two molecules of pyruvate in a series of ten reactions. During glycolysis net two molecules of ATP are synthesised per glucose molecule. Moreover, two molecules of NADH+H+ are also synthesised. In aerobic organisms like monarch butterfly the pyruvate is again oxidised to give acetyl-CoA in the mitochondria. The enzyme responsible for this oxidation is Pyruvate Dehydrogenase Complex. This reaction occurs in the mitochondrial matrix. Here one CO2 molecule is removed from the pyruvate and one NADH is produced.

2. Kreb's Cycle:

The acetyl-CoA formed enters into the Kreb's cycle by condensing with oxaloacetate. In Kreb's cycle acetyl-CoA is completely oxidised to give carbon dioxide in eight enzymatic reactions. During Kreb's cycle NADH, FADH2 and one molecule of GTP is produced and oxaloacetate is regenerated to continue the cycle.

3. Oxidative Phosphorylation:

The NADH produced in the glycolysis and Krebs cycle and FADH2 produced during Krebs cycle are now oxidised to generate proton gradient across the inner mitochondrial membrane. This gradient is generated when the electrons from the reduced NADH and FADH2 are transported in the electron transport chain(ETC), and are finally accepted by the oxygen.

When the electrons are picked up by the complexes of the ETC they pick protons from the matrix. When the electrons are transferred to next complex the protons are transferred to the inter-membrane space. In this way a proton gradient is generated across the innner membrane of the mitochondria.

This proton gradient is used by the complex V of the ETC. This complex is the enzyme ATP Synthase. This enzyme complex is located in the inner mitochondrial membrane. When the protons flow back from the inter-membrane space into the matrix along the concentration gradient , they move through the channel in the ATP Synthase Complex. When these protons flow through this complex it catalyzes the phosphorylation of ADP to give ATP, the energy currency.

The fructose component of the sucrose is first converted into glycogen and then broken down to give glucose-1-phosphate, which enters into glycolysis.

Sucrose cannot enter the pathway of glycolysis as such. It is first hydrolysed to glucose and fructose as described above along with the path way.

What is the responsibility of the Large Intestines?

Answers

Answer:

Since, we know that the large intestines have so many responsibilities .... The purpose of the intestines is basically to absorb water and including salts from a material, Which means it has not yet been digested as food, and also to get rid of any waste products left over, Also this is very important for the intestines to do this process.

Which of the following is NOT a dosage form?

Answers

Answer:

No c Inglés

Explanation:

Tengo 4 años looooool

Can somebody help me?

Answers

Answer:

Sorry but this isn't clear. What I understood was something related to meosis or something. Not sure tho. Plz post it clear so that you do get answer

Explanation:

Which kind of rock is most likely to contain a trilobite fossil?
1) sedimentary
2) igneous
3) metamorphic
4) plutonic

Explain how it formed. Thank you.

Answers

Answer:

Sandstone

Sandstone contains fossils of creatures such as trilobites, brachiopods, crustaceans, bryozoans and plants. Remains of land animals like mastodons and dinosaurs are much more likely to be found in sandstone.

Explanation:

thank me later

The answer issedimentary option 1

10 POINTSSSSSSSSS!!!!!!!!!!!!!!!!!!

Answers

Answer:

13. A group of Roaches moving in a group

14. Stepping on the Roaches to kill them

Answer: First image shows 3 groups with 14 Roaches in each group moving towards an human.

Second image shows the human stepping on the middle group of roaches.

Explanation: Roaches are nasty. Get an exterminator, ya nasty.

A biochemist analyzes the DNA of an organism and determines that it is composed of 28% adenine nucleotides. Using this information, determine the amount of guanine nucleotides in this organism's DNA.
A.
28%
B.
32%
C.
22%
D.
44%
E.
There is not enough information provided to answer this question.

Answers

Answer:

C. 22

Explanation:

I just studied this last week

hy plzzzzz helpp fasttttttttttttrrr​

Answers

Answer:

17. A

18. B (the ability to do work)

19. B

20. A

Transmission electron microscopes that use high-energy electrons accelerated over a range from 40.0 to 100 kV are employed in many applications including the study of biological samples (like a virus) and nanoscience research and development (alloy particles and carbon nanotubes, for example). What would be the spatial limitation (in pm) for this range of electrons

Answers

Answer:

Explanation:

Using the concept of de Broglie wavelength under relativistic conditions to determine the spatial limits for electron range.

de Broglie wave-length [tex]\lambda = \dfrac{h}{p}[/tex]

where;

h = plank's constant

p = momentum of particle which is expressed as:

[tex]p = \dfrac{\sqrt{k^2+2kmc^2}}{c}[/tex]

replacing the expression for (p) into [tex]\lambda = \dfrac{h}{p}[/tex], we have:

[tex]\lambda = \dfrac{h}{\dfrac{\sqrt{k^2 +2kmc^2}}{c}}[/tex]

[tex]\lambda = \dfrac{hc}{\sqrt{k^2+2kmc^2}} --- (1)[/tex]

here;

c = velocity of light = 3 × 10⁸ m/s

h = 4.13 × 10⁻¹⁵ eV.s

i.e.

hc = (4.13 × 10⁻¹⁵ eV.s)(3 × 10⁸ m/s)

hc = 1240 eV.m

The electron's rest energy (mc²) = 0.511 × 10⁶ eV

For the elctrons;

the minimum accelerated voltage = 40kV

the maximum accelerated voltage = 100 kV

the minimum K.E of the electron K = eΔV

K = e × 40 kV

K = 40 KeV

K = 40 × 10³ eV

From equation (1);

[tex]\lambda = \dfrac{hc}{\sqrt{k^2 +2kmc^2}}[/tex]

[tex]\lambda = \dfrac{1240 \ eV.nm}{\sqrt{(40 \times 10^3 \ eV)^2 +2(40 \times 10^3 \ eV)(0.511 \times 10^6 \ eV})}[/tex]

[tex]\lambda = \dfrac{1240 \ eV.nm}{\sqrt{((1600000000) +(80000\times 511000))eV}}[/tex]

[tex]\lambda = \dfrac{1240 \ eV.nm}{\sqrt{((1600000000) +(40880000000)eV}}[/tex]

[tex]\lambda = \dfrac{1240 \ eV.nm}{\sqrt{(42480000000) \ eV}}[/tex]

[tex]\lambda = \dfrac{1240 \ eV.nm}{206106.769 \ eV}}[/tex]

[tex]\lambda = 0.062 \ nm[/tex]

[tex]\mathbf{\lambda = 6.20 \ pm}[/tex]

The maximum K.E of the electron K = eΔV

K = e × 10 kV

K = 10 KeV

K = 100 × 10³ eV

From equation (1);

[tex]\lambda = \dfrac{hc}{\sqrt{k^2 +2kmc^2}}[/tex]

[tex]\lambda = \dfrac{1240 \ eV.nm}{\sqrt{(100 \times 10^3 \ eV)^2 +2(100 \times 10^3 \ eV)(0.511 \times 10^6 \ eV})}[/tex]

[tex]\lambda = 0.037 \ nm[/tex]

[tex]\mathbf{\lambda = 3.70 \ pm}[/tex]

As a result, the spatial limits for the electron's range span from 6.02 pm to 3.70 pm.

Which of the following is not a product of glycolysis?


ATP

glucose

pyruvic acid

NADH

Answers

Answer:

option D

Explanation:

Glycolysis is metabolic pathway that converts to glucose into pyruvate, during the process APT molecules and NADH molecules are produced FADH is not produced

There fore option D is right and the other options are wrong.

Glucose isn't among the products of glycolysis as the glucose is usually

converted to other products.

Glycolysis contains metabolic pathways which converts glucose to ATP

which is a form of energy. Glycolysis comprises of series of reactions and

enzymes which catalyzes every stage.

Glycolysis converts one mole of glucose into products which include ATP,

pyruvic acid and NADH

Read more on https://brainly.com/question/24107405

What is extinction ?

Answers

Answer:

The term extinction's dictionary meaning, is the process of when a species, plant, or any other term for animal family, goes extinct. In more, basic terms, it means when a certain species of animal dies out completely.

This can happen due to several reasons, some being massive natural disasters. Others die out due to an unknown predator entering an ecosystem in which it doesn't belong, therefore disbalancing it.

Examples of extinct animals are Dinosaurs, but their exact reason for going extinct is unkown, there are only theories.

There are also many animals in danger of going extinct, for example Bees.

Hope this information could be of use to you!

Why is it important to know the proper ways on how to sustain Earth's resources?

⚠Nonsense = Report​

Answers

Answer:

Sustainability is important for many reasons including: Environmental Quality – In order to have healthy communities, we need clean air, natural resources, and a nontoxic environment. ... We need clean air, natural resources, and a nontoxic environment.

Type of cell division that is occurring in the cell in the diagram​

Answers

Answer:

There is no diagram but the cell division happens in stages. PMAT is a way to remember them. prophase, metaphase, anaphase, and telophase. This all takes place in Mitosis. Mitosis is the division of cells to make more *identical* cells, (skin cells, stomach cells). But Miosis is the making and division of sperm cells *not Identical* (sperm, and egg cells) are made in this phase.

The enzyme choline acetyltransferase catalyzes the reaction between acetyl-CoA and choline resulting in the formation of the neurotransmitter acetylcholine. This enzyme is produced within the cell body of neurons, but the synthesis of acetylcholine occurs within the axon terminals. What best describes the axonal transport mechanism associated with this process?

Answers

Answer: Anterograde direction.

Explanation:

Choline acetyltransferase is an enzyme made in the body of a neuron and that needs to be transferred to the axon terminal to perform its function. Its function is to bind acetyl-CoA to choline to form the neurotransmitter acetylcholine.

The movement toward the cell body is called retrograde transport and the movement toward the synapse is called anterograde transport. So, since it is produced in the body of the cell and it has to go to the axon terminals, the choline acetyltransferase is transported in the anterograde direction.  

This type of transport is responsible for the movement of organelles such as mitochondria, lipids, synaptic vesicles, proteins from a neuron cell body through the cytoplasm of its axon called the axoplasm. Because axons can sometimes be meters long, neurons cannot rely on diffusion to carry products to the end of their axons. Dynein is a motor protein involved in this retrograde axonal transport. Its light chains bind cargo, and its globular head regions bind the microtubule, "moving forward" along it.

What are the necessary components required to start the transcription of a gene? What needs to be added in order to create a protein?
How does the length of the transcribed region impact the length of the gene (DNA)?
You accidentally produce a gene (strand of DNA) after you have filled up all five of your protein shapes? How would you eliminate this DNA?
Where does the negative transcription factor work?
Why are there more than one positive transcription factors on each of the three genes?

Answers

Answer:

What are the necessary components required to start the transcription of a gene?

Explanation:

Initiation. RNA polymerase binds to a sequence of DNA called the promoter, found near the beginning of a gene. Each gene (or group of co-transcribed genes, in bacteria) has its own promoter. Once bound, RNA polymerase separates the DNA strands, providing the single-stranded template needed for transcription.

I Hope this helps!

Initiation.

RNA polymerase binds to a sequence of DNA called the promoter, found near the beginning of a gene. Each gene has its own promoter. Once bound, RNA polymerase separates the DNA strands, providing the single-stranded template needed for transcription.

What is transcription?

Transcription is the process in which a gene's DNA sequence is copied (transcribed) to make an RNA molecule.RNA polymerase is the main transcription enzyme.Transcription begins when RNA polymerase binds to a promoter sequence near the beginning of a gene.

Learn more about transcription below,

https://brainly.com/question/1433349

#SPJ2

What is the probability of producing a child that will phenotypically resemble either one of the two parents in the following four cases? How many phenotypically different kinds of progeny could potentially result from each of the crosses? Aa Bb Cc Dd X aa bb cc dd

Answers

Complete question:

What is the probability of producing a child that will phenotypically resemble either one of the two parents in the following four cases? How many phenotypically different kinds of progeny could potentially result from each of the crosses?

a. Aa Bb Cc Dd  × aa bb cc dd

b. aa bb cc dd × AA BB CC DD

c. Aa Bb Cc Dd × Aa Bb Cc Dd

d. aa bb cc dd × aa bb cc dd

Answer:

a) the probability of producing a child that will phenotypically resemble either one of the two parents is 1/8.

   There will be 16 possible phenotypes among the progeny

b) the probability of producing a child that will phenotypically resemble either one of the two parents is 1.

   There will be one possible phenotype among the progeny

c) the probability of producing a child that will phenotypically resemble either one of the two parents is 81/256 = 0.316.

   There will be 16 possible phenotypes among the progeny

d) the probability of producing a child that will phenotypically resemble either one of the two parents is 1.

   There will be one possible phenotype among the progeny

Explanation:

Due to technical problems, you will find the complete explanation in the attached files

Let's start with a ham and cheese sandwich with lettuce and pickles. As I bite into my sandwich the teeth are present for mastication to begin the process of mechanical digestion and the saliva begins to mix with my food where salivary amylase is present and starts the digestion of the starchy bread. What happens next? (Think about the carbohydrates, proteins and fat in our sandwich

Answers

Answer:

Explanation:

After amylase act on carbohydrates, the chyme pass through the oesophagus down to the dudoneum in the small intestine. Amylase also continue to break it down into disacharrides and enzymes like maltase, sucrase and lactase are released to further break it down into maltose, sucrose, and lactose then finally glucose, a way it can be absorbed easily by the epithelial walls.

The digestion of lipids and protein begin in the dudoneum of small intestine.

Trypsin act on protein and break it down to peptides. Peptidase is then released and break it to single chain peptides bond. In the small intestine, dipeptidases break it down into amino acids easily absorbed by the epithelial walls.

The bile in the gall bladder produce enzyme called lipases which breakdown lipids and make it to undergo emulsification.

Lucas places 20 kg samples of each substance by the same heat source all samples are at the same initial temperature which sumvstance will have the greatest temperature after some period of time

Answers

Answer:

Metallic structure with black colour body.

Explanation:

The substance has metallic structure and black colour body will have greatest temperature among other substances because metallic structure and black colour of body heat up very quickly. Metals have free electrons which make it the best conductor of electricity and heat while on the other hand, black colour is a good absorbent which absorb heat very quickly so that's why we can say that metallic solids are the substance that have the greatest temperature.

Answer:

copper

Explanation:

it copper because it have less specific heat (j/kgoc)

c: i just answered it and got it right

Answers

Answer:

good for you lol

Explanation:

Why do people sneeze and cough?

I will give brainly if you explain why.

Answers

The sneezing is release of air that helps the body to get rid of irritants in our nose and throat, like allergens, dirt, and dust.

Coughing is by forcing the air out of the lungs with high pressure, to clear the throat of these foreign particles.

Which process causes Earth's surface to warm?

Answers

Answer:the radiation of the Sun’s electromagnetic waves

Explanation:

The radiation of the suns electromagnetic waves the convection of air from the atmosphere
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VALUINGExplain the role of creativity in writing a literature review? Which of the following best describes John Wilkes Booth? a professional actor and fierce abolitionist a Republican politician who supported slavery a professional actor and fierce anti-abolitionist a Republican politician who opposed slaveryno scam please the ratio of a map is 1:100the distance from point A to B in the map is 8cmwhat is the real distance from A to B the data below shows.the number of car thefts in a city for a period of 20 days. complete parts (a) and (b) below. a. draw an ordered stem and leaf plot for the data. b. revealed when answer a is complete. Please Help I'll give brainliest ead the excerpt from "The Scarlet Ibis." There is within me (and with sadness I have watched it in others) a knot of cruelty borne by the stream of love, much as our blood sometimes bears the seed of our destruction, and at times I was mean to Doodle. One day I took him up to the barn loft and showed him his casket, telling him how we all had believed he would die. It was covered with a film of Paris green sprinkled to kill the rats, and screech owls had built a nest inside it. Doodle studied the mahogany box for a long time, then said, "Its not mine." "It is," I said. "And before Ill help you down from the loft, youre going to have to touch it." What symbol is described in this excerpt, and what does it represent? what is the ordered pair for the equation -7x+3y=2 What what and why does Jesus need to keep his children away from sin Trapezoid A B C D is shifted down and to the left to form trapezoid A prime B prime C prime D prime. Trapezoid A prime B prime C prime D prime is rotated 270 degrees about point B.What is the final transformation in the composition of transformations that maps pre-image ABCD to image A"B'C"D"?a translation down and to the righta translation up and to the righta 270 rotation about point B'a 180 rotation about point B' 12. Which of the following would be included in the scope of a project? drawings and storytelling goals and objectives computers and comic books superstitions and wishful thinking What is the difference, if any, between slander and libel?A) Libel is illegal, while slander is legal but still considered unethical.B) Libel is made in public in a verbal way, and slander is written.C) Slander is illegal, while libel is legal but still considered unethical.D) Slander is made in public in a verbal way, and libel is written. A 1.0 g sample of propane, C3H8, was burned in calorimeter. The temperature rose from 28.5 0C to 32.0 0C and heat of combustion 10.5 kJ/g. Calculate the heat capacity of the calorimeter apparatus in kJ/0C Please help me with this. Ill give you a brainliest. Which of the following is not a concern associated with fossil fuel dependence?A. global warmingB. rising pricesC. increased competitionD.increased developmentPlease select the best answer from the choices provided Most of North America has the same climate type Choose the expression that represents three less than seven times a number PLEASE TELL ME THE AWNSERS ITS A DOC FILE SO OPEN IT I WILL GIVE BRAINLIEST PLS HURRY The base of triangle M is four times the base of tri-angle N, while the height of triangle N is half theheight of triangle M. The area of triangle M is howmany times that of triangle N ? !! WILL GIVE BRAINLIEST !!Use the map to answer the following question:Political map of North and South America, showing Aztec, Maya, and Inca civilizations. Aztec civilization is shaded in pink in mid Mexico, spanning from the east to west coasts, bordered by the Pacific Ocean and the Gulf of Mexico. The Maya civilization is shaded in purple, just south of the Aztec area, with coastline on the Pacific Ocean, the Gulf of Mexico, and the Caribbean Sea on the Yucatan peninsula. The Inca civilization is on the west coast of South America, spanning a large area along the coast of the Pacific Ocean.The Olmec civilization is smaller, noted in blue, and sits at the southwest tip of the Gulf of Mexico, between the Aztecs and the Mayas. 2012 The Exploration CompanyWhich of these questions can be answered with the information in the map? Which civilizations were likely to trade and share culture with the Aztecs? What geographic feature marked the eastern edge of the Inca Empire? What were the populations of the Maya and Inca civilizations? Which civilization included the city of Tiwanaku? A circle with the centre (0,0) has an equation of x2 + y2 = 169a. What is the radius?