Answer:
Griffith's experiment, reported in 1928 by Frederick Griffith, was the first experiment suggesting that bacteria are capable of transferring genetic information through a process known as transformation. Griffith's findings were followed by research in the late 1930s and early 40s that isolated DNA as the material that communicated this genetic information.
Griffith's experiment discovering the "transforming principle" in pneumococcus bacteria.
Pneumonia was a serious cause of death in the wake of the post-WWI Spanish influenza pandemic, and Griffith was studying the possibility of creating a vaccine. Griffith used two strains of pneumococcus (Streptococcus pneumoniae) bacteria which infect mice – a type III-S (smooth) which was virulent, and a type II-R (rough) strain which was nonvirulent. The III-S strain synthesized a polysaccharide capsule that protected itself from the host's immune system, resulting in the death of the host, while the II-R strain did not have that protective capsule and was defeated by the host's immune system. A German bacteriologist, Fred Neufeld, had discovered the three pneumococcal types (Types I, II, and III) and discovered the quellung reaction to identify them in vitro. Until Griffith's experiment, bacteriologists believed that the types were fixed and unchangeable, from one generation to another.
In this experiment, bacteria from the III-S strain were killed by heat, and their remains were added to II-R strain bacteria. While neither alone harmed the mice, the combination was able to kill its host. Griffith was also able to isolate both live II-R and live III-S strains of pneumococcus from the blood of these dead mice. Griffith concluded that the type II-R had been "transformed" into the lethal III-S strain by a "transforming principle" that was somehow part of the dead III-S strain bacteria.
Completing the attached chart about the three main research projects ;
Griffith summary of research : Identified what R-strain bacteria took up from heat-killed S bacteria,Avery summary of research : Identified protein as not the transforming factorAvery summary of conclusion : Found a " transforming principle "Hershey and chase summary of conclusions : Found the " Infection and replication principle "All three researches were carried out to discover the genetic material ( DNA ) which is responsible for the transfer of genetic traits from parent cells to daughter cells.
Griffith research shows that bacterias can get there DNA ( genetic material ) through a process known as transformation and the experiment to prove this research was carried out by killing S bacterias through heat and then adding them to R-strain bacteria. Griffith observed and concluded that the Genetic materials of the S bacteria was taken up by the S -bacterias through a process known as " transforming principle "
During Avery research for the genetic material ( DNA ) Avery treated a mixture with DNA-destroying enzymes to see if the colonies of the mixture will transform but they failed to transform which proves that proteins are not the transforming factors and that DNA is the genetic material.
Hence we can conclude that Completing the attached chart about the three main research projects is as written above.
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A fertilization
B prophase II
C polyploidy
D crossing over
Answer:
Hi, there your answer D. Crossing Over
Explanation:
Glycolysis takes place in _________________.
The cytoplasm
The mitochondrial intermembrane space
The mitochondrial matrix
The endoplasmic reticulum
Answer:
It occurs in the cytoplasm. Glycolysis also involves two stages which break up glucose. In the 1st stage, Glucose is broken into two phosphorylated 3-carbon compounds through a series of reactions.
What is one advantage of having many small cells instead of one large cell?
A. Small cells do not have cell membranes.
B. With many small cells, you have more surface area.
C. With many small cells, you produce less protein.
O D. Small cells do not require a stable internal environment.
having one large cell simply means that you can't move your limbs, so I say D
please help ill give brainliest :)) A coach travels from the station to the beach, a distance of 430 km away in 7 hrs. The coach is only allowed to travel at a maximum speed of 95 km/h. Did the coach break the speed limit?
Answer:
No he did not break the speed limit
Explanation:
430÷7=61.43mph
The prime mover of the elbow extension is the
Answer:
triceps brachii muscle
The prime mover of elbow extension is the triceps brachii muscle, and is assisted by the much smaller anconeus muscle. All anterior (front) arm muscles cause elbow flexion. These muscles are the biceps brachii, brachialis and brachioradialis.
Explanation:
thank me later
Answer:
the other person is correct
When species become challenging to classify, what is the most accurate technology for their identification?
DNA sequencing
DNA electrophoresis
DNA amplification
DNA barcoding
DNA replication
Answer:
Sería códigos de ADN
Explanation:
Espero ayudarte
malaria is caused by—
Answer:
caused by plasmodium and transmitted by infected Andes mosquitoes
Q6. In mice, the allele for black hair color is (B) dominant to that for brown (b), the allele for
short hair (H) is dominant to that for long hair (h). The gene for hair color and length are not
linked (i.e. they are on separate chromosomes).
One colony (colony A) of mice was pure breeding for short hair; a second colony (colony B) was
pure breeding for long brown hair.
a. A male from colony A was mated with a female in colony B.
i.
Give the genotype of the male from colony A and the genotype of female in
colony B. (2mks)
ii.
These two mice were crossed and produce a large number of offspring (F1).
Construct punnet squares to show this result (3mks)
iii.
Give the genotypes and phenotypes (ratio) of this F1 generation (2mks)
Genotypes:
Phenotypes:
Answer:
The correct answer is -
A (i) a male from colony A HH and female from colony B bbhh
(ii) the offspring will be heterozygous for short brown hair
(iii) genotype 100% Hhb, phenotype - 100% short brown hair
Explanation:
It is given that parent one is from Colony A that is pure breeding for short hair which means p1 is HH and parent 2 is from colony B that is pure breeding for long brown hair that means p2 is bbhh.
Cross between HH and bbhh
Gemetes : H, H, and bh, bh,
Punnet:
bh bh
H Hhb Hhb
H HhB Hhb
Thus, the offspring will be heterozygous for short brown hair
The purpose of using the binomial scientific names is to
Give each organism a unique name
Give each species a unique name
Study how the environment affects different organisms
Study the evolution of life
Protect endangered species
Answer:
study the evolution of life
In a particular population, the allele frequency of the ABO blood type alleles are as follows: IA is 20%, IB is 30% and i is 50%. If mating is random and the population is in Hardy-Weinberg equilibrium, what percentage of the population will have type O blood type
Answer:
The genotypic frequency F(ii) = 0.25 = 25%
Explanation:
Due to technical problems, you will find the complete explanation in the attached files
In the blood type cases involving the ABO group, the type of inheritance here is the co-dominance type of inheritance
The percentage of the population with type O blood will be 25%
Type A (IA) is dominant to type O (i) and at the same time type B (IB) is also dominant to type O (i).Using the equation - p² + 2pq + q² + 2pr + r² + 2qr = 1Where p² indicates the genotypic frequency with type A (AA) blood and q² indicates genotypic frequency of BB and r² indicates the genotypic frequency of OO.Since we are finding the percentage with type O blood (r²) where r (allelic frequency of type O) is 0.5 (50%)
r² = 0.5² = 0.25 = 25%.
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Food chains end with a species that…
la rosa pertenece a un grupo de arbustos que puede ser homocigotico para expresar el tallo alto (TT) y se crusa con una homocigotica de tallo (tt) sabiendo que el tallo alto es dominante sobre el tallo enano ¿cómo serán los genéricos y fenotipos de la F1 yF2
describe nutrition in insect
Answer:
Lots of insects eat plants, some insects eat other insects, and some even drink blood. Many insects eat nectar from plants. And some insects will eat whatever scraps of food you leave lying around. A few insects, such as mayflies and some moths, never eat.
Explanation:
How can you drop two eggs the fewest amount of times, without them breaking?
Answer:
yes yes i have seen this before,let me guess its from go.ogle
from calculating how thick and strong the shell is i prefer using a egg with a born baby inside becasue it takes energy from divideing cells thus making it lighter and less likly to break and they can stand a weight of 130 pound weight without breaking thus 6 inches to 8 inches will be the answer
i prefer ostrich eggs and make sure to get younger birds they have harder eggs
thus you can keep doing it and 3 out of 10 egg shall break this is real math so ya
Explanation:
Which element is considered the most versatile element in living organisms and why?
Answer:
carbon
Explanation:
Because it can bond with many elements of form complex.
NEEDED NOW ASAP HURRY PLEASE
Answer:
D
Explanation:
because the populations have become different, they can no longer breed making it harder from them to grow.
Define "CFU.” Why is this term used instead of simply using "cell count"?
What makes a predator different from a parasite?
A predator has a long relationship with its food.
A predator kills its food organisms faster.
A parasite has a brief relationship with its food.
A parasite kills its food organisms faster.
Which of the following are characteristics of Ascomycota? Check all that apply.
flagellated spores
spores produced in the ascus
lack reproduction phase
important in the food industry
important in the digestion of animals
can cause disease in plants
can cause disease in animals
2. spores produced in the ascus
4. important in the food industry
6. can cause disease in plants
Explanation:
hope this helps :)
Ascomycota is the phylum of fungi which produce spores in the ascus, important in the food industry, and can cause disease in plants. Thus, the correct options are 2, 4, and 6
What are ascomycetes?Ascomycota is a phylum of the kingdom fungi that, together with the Basidiomycota phylum of the fungi. The members of ascomycota are commonly known as the sac fungi or ascomycetes. Ascomycota is the largest phylum of Fungi, with over 64,000 species.
Ascomycetes are commonly known as sac-fungi as they are produced in a sac-like structure called as ascus. Inside this ascus, non-motile microscopic sexual spores are formed which is a defining feature of this kingdom fungi.
Therefore, the correct options are 2, 4, and 6.
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Nuclear power plants produce large amounts of
Answer:
Nuclear reactors are, fundamentally, large kettles, which are used to heat water to produce enormous amounts of low-carbon electricity. They come in different sizes and shapes, and can be powered by a variety of different fuels.
Explanation:
Hope this helps!! :))
Which term best describes the plasma membrane?
Which term best describes the plasma membrane?
Static
Dynamic
Impermeable
Rigid
Answer:
The plasma membrane, also called the cell membrane, is the membrane found in all cells that separates the interior of the cell from the outside environment. ... The plasma membrane consists of a lipid bilayer that is semipermeable. The plasma membrane regulates the transport of materials entering and exiting the cell.
Dynamic term describes the plasma membrane. So, the correct option is (B).
What is Plasma membrane?Plasma membrane also known as cell membrane is a membrane found in all cells that separates the interior of the cell from the external environment. The plasma membrane consists of a lipid bilayer that is semi-permeable that regulates the transport of materials entering and exiting the cell.
This membrane is called a selectively permeable membrane because it controls the movement of substances in and out of the cell, which means that the plasma membrane allows certain materials to pass through it, while at the same time it prevents other materials from entering through it. Plasma membrane is dynamic in nature.
Thus, Dynamic term describes the plasma membrane. So, the correct option is (B).
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to separate hucks and grains in field
a) tailor
b) grocer
c) farmer
d) watchman
Answer:
C
Explanation:
Comment its correct or not correct please
How is blood different after it is pumped through the capillaries in the intestines?
Answer: nutrients are absorbed then it goes into the bloodstream through capillaries. These nutrients include acids, vitamins and fatty acids
Explanation:
the answer is above
O aglomerado de moléculas orgânicas, revestido por uma película de moléculas de água e que, na opinião de alguns cientistas, pode ser um dos primeiros passos rumo à origem da vida, chama-se: *
(a) Aminoácido.
(b) Enzima.
(c) Micro-organismo.
(d) Coacervado.
(e) Proteína.
Density is mass per unit of volume. Which pair of lab instruments would a student use to measure the density of seawater?
A. a caliper and a flask
B. a stopwatch and a beaker
C. a balance and a beaker
D. a meter stick and a temperature probe
Explanation:
A balance would be used to measure the weight, which in turn effectively measures the mass (more or less). Imagine that we have a brick that we know is 1 pound. If we have an object that needs 5 bricks on one side to balance it out, then we know the object is 5 pounds.
The beaker is used to measure the volume. It's basically a measuring cup that you would find in the kitchen.
To get the density, you divide the mass over volume.
For example, if you have a material that has a mass of 100 grams and it's volume is 20 cm^3, then its density is 100/20 = 5 grams per cm^3.
Answer:
C! Correct on Edge, and got 100% on this test!
Explanation:
what is the role of the shrimp with respect to phytoplankton in this food chain
Explanation:
The answer is B. that is "Prey"...
The correct answer is option (b) Prey.
What is shrimp?
A small free-swimming crustacean with an elongated body, typically marine and frequently harvested for food.What is phytoplankton?
Plankton consisting of microscopic plants is called phytoplankton.Why other options are incorrect?
Option (a), (c), (d) is incorrect because, prey means the phytoplankton is the food of shrimp.
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How does carbon cycle through Earth's systems? A. As fossil fuels are burned, carbon dioxide is made available for photosynthesis in animal cells. When the animals die, carbon is released into the soil, and the animal remains form new fossil fuels. B. Animals absorb carbon dioxide through their skin. Dead animals release carbon into the soil. Plants absorb the carbon from the soil and release carbon dioxide during photosynthesis. C. Plants absorb carbon dioxide through their leaves. Animals take in the carbon when they eat the plants. Animals exhale carbon dioxide. Dead plants and animals release carbon into the soilling D. Photosynthesis releases carbon dioxide into the atmosphere Cellular respiration uses carbon dioxide
Answer:
D. Photosynthesis releases carbon dioxide into the atmosphere Cellular respiration uses carbon dioxide.
Explanation:
Carbon dioxide is taken out of the air by the photosynthesis process to make carbon food for crops.
Animals and plants need a mechanism called respiration to remove carbon dioxide gas.
When combustibles are burned, carbon flows from fossil fuels to the air.
1. The diagram to the right represents events that occur during sexual
reproduction. The stages labeled A, B, and Care necessary to ensure that
the offspring will inherit
1. half of their chromosomes from each parent
2. double the amount of chromosomes from each parent
3. pairs of chromosomes from each parent
4. double the amount of chromosomes from one parent
half of their chromosomes from each parent
Explanation: you get half of your chromosomes from each of your parents
What is the driving force behind adaptative evolution?
A.better regulation of body heat
B.more efficient digestion
C.increased reproductive success
D. increased size
Identify the part of the plant where photosynthesis primarily occurs.
Answer: In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll.
Explanation:
Answer:
on plato its the first box
Explanation: