Answer:
It will take 63 years
In 189 years, one-eight of the sample will be left
By multiplying the number of half-life cycles
Explanation:
I just completed this assignment.
A scientist is studying a radioactive element that has a half-life of 63 years. It will take 63 years, In 189 years, one-eight of the sample will be left.
what is the meaning of half life ?A radioactive element is defined as the material when it changes its atomic number or weight by emitting energy, the energy may be either Alpha, beta, or gamma forms of radiation.
Alpha is a Helium nucleus, a beta particle is an electron and a gamma is high energy electromagnetic radiation. Half-Life can be defined as the time required by which the radioactive substance to split into a different substance.
The half life was first discovered by Ernest Rutherford and represented by the Ug or t1/2, If the radioactive element has one-hour of half-life, it means one half of the element would decay within an hour and the remaining part would decay in another hour.
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Describe how energy flows through an energy pyramid? Write your answer in the space provided below.
Answer:
Depending on the food pyramid, on the side there may be something that says decomposers. These eat from all of the sections of the pyramid.
Energy flows from the bottom to the top, and then to the side with the decomposer.
Studying which of the following would provide the best evidence that two organisms share a common ancestor?
A: Amino acid sequence
B: Dietary preferences
C: Habitat requirements
D: Social group interactions
Answer:
A
Explanation:
Studying amino acid sequences would provide the best evidence that two organisms share a common ancestor.
Amino acid sequence is a series of bases with different letters usually four(A T C G or U) this letter contains information of an individual when translated.
The amino acid sequence of 2 or more individuals can be compare to each other through the process called Blasting using a tool called Blast
Blast generates alignments or similarities between a amino acid or protein sequence.For organisms that are phylogenetically close i.e related by an ancestor, there will be similarities between their DNA sequences when compared. The amino acid sequence of an individual contains the information of the individual and it is unique for each individual.
Hence, amino acids sequence provides the best evidence of organisms sharing a common ancestor.
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what is the difference between sexual and asexual reproduction for plants and animals?
Answer:
That is the main difference between sexual and asexual reproduction. Sexual reproduction just means combining genetic material from two parents. Asexual reproduction produces offspring genetically identical to the one parent.
For each codon, find the correct tRNA anticodon and drag it to the ribosome. Start with the AUG codon
in the ribosome. Find and drag its match, the UAC anticodon, to it. Also, record this pair and the
associated amino acid, Met, to complete the first row of the data table.
PLEASE HELP I DONT KNOW HOW TO DO THIS AT ALL
Drag the correct tRNA anticodon into the ribosome. Therefore, A matches U and C matches G.
What is the UAC anticodon?The Ribosome Workbench uses the AUG codon as a universal signal to initiate translation. Because the methionine-bound tRNA has the anticodon sequence UAC, the AUG start codon signals the ribosome to insert into the amino acid methionine.
What is the correct tRNA anticodon for the mRNA codon 5 GGA 3?1 One codon is 5'-ACG-3'. What is the sequence of tRNA anticodons that bind? Which amino acids does tRNA have? The sequence of the tRNA anticodon is 3'-UGC-5', and the tRNA has the amino acid Thr, the amino acid encoded by the codon.
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Which of the following is not a factor that affects biodiversity?
a - land area
b- climate
c- diversity of niches
d- cancer fighting drugs
Answer:
B. duhhhh
Explanation:
A 100 kg box is initially at rest on a level surface. One 10 N force acts on the box , directed toward the right. A second 10 N force acts simultaneously on the box , directed toward the left , as shown.
Since 10 N forces are acting from both sides, these are balanced forces and the box will not move because balanced forces are acting on it. So the correct option is D.
What are balanced forces?Forces that are equal in magnitude and opposing in direction are said to be balanced forces. Equilibrium is seen as a condition of balanced forces. There is no shift in direction when the forces are in balance.
Balanced combined forces have always been equal to zero. These are vectors for merging. Balance forces cannot alter an object's momentum or direction.
An item is kept traveling at a constant speed by a balanced force. In it, Newton's First Law of Motion is explained. A good illustration of a balanced force is a book on the table. The normal force (support force) of the table balances out the weight of the book. The two forces are exactly equal and opposed to one another.
While forces that are balanced can keep an item at rest or move at a steady speed, unequal forces can cause things to accelerate.
Therefore the correct option is D.
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The union of a sperm and an egg during the life cycle of a jellyfish is best described as
a
b
ОООО
sexual reproduction
genetic inheritance.
asexual reproduction,
genetic engineering,
d
Answer:
Sexual reproduction and asexual reproduction
Explanation:
this is because the jellyfish takes on two different body forms that is medusa and polyps. polyps produce asexually by budding while medusa pawn eggs and sperm to produce sexually
do all DNA from organisms look the same?
Answer:
no they do not
Explanation:
When you see wood burning, what evidence do you observe that a
chemical change is happening? Click ALL that apply.
Answer: It's heat given off
Explanation:
The diagram below shows different layers of sedimentary rocks.
Based on the diagram, which of these inferences is most likely correct?
A Layer B is older than Layer G
B Layer F is older than Layer D
C Layer A and Layer B were formed at the same time
D Layer D and Layer C were formed at the same time
Answer:
B. Layer F is older than Layer D
Explanation:
Of the alternate energy sources you have learned about, which one do you think is the most likely to become a part of our country's future. Why do you feel this way?
Answer:
probably water wheels
Explanation:
you get brainliest if you answer right
Answer:
Br, Zn, Sc, Ca, K
Explanation:
ez
Which of the following is not a technological way of improving air quality?
a.
using electrostatic precipitators
b.
installing solar panels
c.
composting
d.
building wind turbines
Answer:
c.
composting
Explanation:
Composting is not a technological way of improving air quality (Option C).
What is air quality?Air quality refers to the absence of pollutant substances (e.g. monoxide carbon) in the air.
Air quality is fundamental for maintaining overall health and increasing the quality of life.Air quality can be measured by using different devices or indicators (for example, by measuring the amount of carbon monoxide and nitrogen oxides).In conclusion, composting is not a technological way of improving air quality (Option C).
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Which type of energy
does respiration release?
chemical
thermal
potential
kinetic
Answer:
Respiration releases energy it is an exothermic process. The energy is stored in molecules of ATP . ATP can be broken down in other processes in cells to release the stored energy.
chemical
Phylum Mollusca has organisms with tubed feet.
Answer:
The phylum of mollusks includes more than 50000 known species, found in freshwater ... Echinoderms have a water vascular system originally used to collect and ... by expanding or contracting their rows of tube feet in a particular sequence.
Explanation:
true
Cells reproduce by splitting in half a process called cell division what do you cells need between divisions to make sure that they don’t get smaller and smaller
What number go in each circle ?
What number go in both circle?
Answer:
1 goes in the middle of all of the circles. 2 goes in animal cell. 3 goes in plant cell. 4 goes in between animal and plant cell. 5 goes in The middle of all of the circles. 6 goes in the middle of all of the circles. 7 goes in the bacteria circle. 8 goes in bacteria. 9 goes in bacteria.
Also:
8 and 9 I'm not completely sure of. Let me know if I'm wrong. Good Luck! :D
Problem A
A yellow purebred dog is crossed with a a black hybrid dog
(black is dominant)
An air mass that originates over land in Central America is most likely
Answer:
An air mass that originates over land in Central America is most likely warm & dry.
Explanation:
Answer:
Warm and Dry
Explanation:
A P E X answer
I need help pls hook me up
Answer:
B. Madreporite
Explanation:
The exchange of carbon dioxide and oxygen during Photosynthesis and cellular respiration worldwide helps to keep atmospheric oxygen and carbon dioxide at what level
Answer:
Stable levels....Explanation:
The exchange of carbon dioxide and oxygen during photosynthesis (Figure below) and cellular respiration worldwide helps to keep atmospheric oxygen and carbon dioxide at stable levels. Cellular respiration and photosynthesis are direct opposite reactions.
hope it helps youpls mark me as branliestHelp plz! To identify a species, you must first do what?
Answer:
look at the animal and or fossil and relate it to others
Explanation:
Answer:
To identify the species you must first need to find following things -
I) whether the organisms is unicellular or multicellular
ii) Mode of nutrition
iii) Place where it lives
if) Body structure.
What binomial nomenclature? A two-word name for organisms where the first word is the family and the second word is the species
A two-word name for organisms where the word is the genus and the second word is the species
A two-word name for organisms where the first is the genus and the second word is the class
A two-word name for organisms where the first word is the species and the second word is the genus
Answer:
A two-word name for organisms where the word is the genus and the second word is the species
Explanation:
Binomial nomenclature is the system biologists use to name species of living beings. When we translate this term, we get the two-name naming system. This tells us a lot about how species are named - their name consists of two components. The first component is the name of the genus the species belongs to and the second is the name of the species. For example, the scientific name used for cats is Felis catus. Felis is the genus and the species is catus.
"CRISPR" stands for Clustered Regularly Interspaced Short Palindromic Repeats, which are the hallmark of a bacterial defense system that forms the basis for CRISPR-Cas9 genome editing technology. In the field of genome engineering, the term "CRISPR" or "CRISPR-Cas9" is often used loosely to refer to the various CRISPR-Cas9 and -CPF1, (and other) systems that can be programmed to target specific stretches of genetic code and to edit DNA at precise locations, as well as for other purposes, such as for new diagnostic tools. How can this tool be used to alter genes in various organisms?
Answer:
by designing short guide RNAs (sgRNAs) customized to target genes of interest in the cells of these species
Explanation:
The CRISPR-Cas9 editing system is a versatile and powerful genome engineering tool for editing genomes, which can be directed to alter almost any DNA sequence in order to modify gene function. This system consists of an endonuclease protein (Cas 9) that cuts DNA at specific sites guided by a short guide RNA (sgRNA), which binds by base complementarity to the target sequence. This sgRNA must be designed with efficiency and specificity to target genes of interest. In consequence, the CRISPR-Cas9 genome editing system produces DNA double-strand breaks which may be repaired by 1- error-prone nonhomologous end joining (NHEJ) or 2-homology-directed repair (HDR) DNA repair pathways. According to the DNA repair pathway that has been activated, it is possible to trigger genetic modifications in the cells of different species (i.e., plant cells, animal cells, human cells, etc).
How many neutrons does this atom have?
4
6
10
14
Answer:
I believe there are 6
Explanation:
Protons are the positively charged circles (blue)
Neutrons are the Neutral (red)
and the others (green) are called electrons
Explain how a person could be born with an XX karyotype but develop male sex characteristics. Be specific.
Answer:
SRY-positive 46,XX testicular disorder of sex development.
Explanation:
If a fetus is conceived from a sperm cell with an X chromosome bearing the SRY gene, it will develop as a male despite not having a Y chromosome.
Explain how specific proteins are formed from a strand of mRNA.
Answer:
During translation, ribosomes move along an mRNA strand, and with the help of proteins called initiation factors, elongation factors, and release factors, they assemble the sequence of amino acids indicated by the mRNA, thereby forming a protein.
Explanation:
Answer:
Explanation:
Los ARN mensajeros, también conocidos como ARNm, son uno de los tipos de ARN que se encuentran en la célula. Éste en particular, como la mayoría de los ARN, se sintetiza en el núcleo y luego se exporta al citoplasma, donde la maquinaria de traducción, la maquinaria que realmente fabrica las proteínas, se une a las moléculas de ARNm y lee en ellas el código para producir una proteína específica. Así que en general, un gen, el ADN de un gen, puede ser transcrito en una molécula de ARNm que puede acabar dando lugar a una proteína específica.
Why am I so saddened
Answer:
stress
Explanation:
u are studying some things that are keeping u sad
and if u don't open up ur gonna suffer from anxiety
Answer:
Try meditation it helps
Explanation:
School makes everyone sad dw.
If the sun is so massive, why does the Earth have a greater pull on the moon than
the sun does?
Answer:
Even though the sun is much more massive and therefore has stronger overall gravity than the moon, the moon is closer to the earth so that its gravitational gradient is stronger than that of the sun
in which direction do particles in a solution move during passive transport
During the passive transport, the particles move from a higher concentration to a lower concentration without the need for energy expenditure or spending. The passive transport is seen in the cell too.
What is the importance of the different types of transportation?In the cell, different types of transport are seen, such as active transport and passive transport; in active transport, energy is used, while energy is not used in passive transport. The movement of molecules across the cell plasma membrane is important because it allows cells to get rid of unwanted molecules. Passive transport does not require energy, and many nonpolar small molecules and gases can cross the lipid plasma membrane barrier and go into and out of the cell while, in this passive transport process, they save the cell's energy.
Hence, during the passive transport, the particles move from a higher concentration to a lower concentration without the need for energy expenditure or spending.
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