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Crank
4 years ago
13

Why do you think DNA is duplicated before

Biology
1 answer:
Anna71 [15]4 years ago
5 0

The two cells that result from a single cell need to have the same amount of genetic material as the initial cell, therefore the DNA needs to be duplicated before the cell divides.

The sister chromatids are attached together so that during anaphase the daugther cells will receive the same chromosomes

You might be interested in
Mosses and ferns differ in their reproductive strategies from gymnosperms and angiosperms in which of the following ways?
In-s [12.5K]

Answer:

The correct answer will be option-A

Explanation:

The Mosses are the non-vascular plants that were developed from the aquatic plants and the ferns are the vascular plants which developed from the bryophytes.

Their life cycle shows alternation of generation and is largely dependent on the water for reproduction mainly fertilization or fusion of gametes.

The male gametes produced in these plant groups are haploid and are released in water which fuses in water with female gamete which is distinct from the higher plant groups gymnosperms and angiosperms where fertilization is mediated by mostly the wind or insects.

Thus, option-A is the correct answer.

7 0
4 years ago
__________ is best defined as a sudden variation in an inheritable characteristic, as distinguished from a variation that result
Sloan [31]

Answer: Mutation

Explanation: Mutation is a change in DNA sequence, it may occur due to error when the DNA is copied or it can arise from various environmental factors such as exposure to chemicals, UV radiation, Highly infectious microbes.

Mutation maybe spontaneous. Acquired mutations occur at some point in a person's life and are present only in certain cells, not in every cell in the body while some may target a tissue, an organ or an entire system.

7 0
3 years ago
The inner membrane of the mitochondrion is folded into cristae. The cristae _____ the surface area of the inner membrane, _____
Jet001 [13]

Answer:

The inner membrane of the mitochondrion is folded into cristae. The cristae

<u>increase</u> the surface area of the inner membrane, <u>enhancing</u> the mitochondrion's ability to produce ATP through <u>cell respiration</u>.

Explanation:

Options for this question are

  • <em>increase - inhibiting - photosynthesis</em>
  • <em>decrease - enhancing - cell respiration</em>
  • <em>increase - enhancing - cell respiration</em>
  • <em>decrease - inhibiting - photosynthesis</em>

Mitochondria are the organelles in charge of energy production inside the cell. For the mitochondrion to achieve its goal, a series of metabolic processes must occur, that require the presence of oxygen and organic substrates.

Mitochondrial cristae are the configuration of the mitochondrial internal membrane, with the purpose of increasing the surface where metabolic reactions and the electron transfer chain occur, in order to obtain ATP molecules, during the process of oxidative phosphorylation, also called cellular respiration.

Learn more:

Mitochondrion brainly.com/question/1128811

8 0
3 years ago
Which of the following is a detritivore?
Alona [7]

A detritivore is a animal that feeds on dead organic matter. A good example for a detritivore will be option C "Earthworm." A Earthworm feeds on dead organic matter such as dead plants, animals, rotten fruit, etc...

Hope this helps.

4 0
3 years ago
The GFP gene ___________.
snow_lady [41]

Answer: c. will be transcribed by RNA polymerase to produce the GFP mRNA. The GFP mRNA will be translated by ribosomes to produce the GFP protein, which will glow bright fluorescent green color under UV light

Explanation:

<u>A gene is a sequence of DNA, which encodes for a protein.</u> DNA is made up of nucleotides and ther are four types: adenine (A), thymine (T), guanine (G) and cytosine (C). The order of these bases determines which protein will we produced.

To synthesize the protein, first the gene in the DNA must be transcribed to mRNA by action of the RNA polymerase that uses the DNA strand as a template to copy its bases and form a complementary RNA strand.

Then, the translation process occurs. This occurs in ribosomes, where each RNA codon (set of three bases) codes for an amino acid. That's how a protein is synthesized.

<u>GFP is a Green fluorescent protein which is used to tag proteins and to study many cellular processes in cells. </u>This protein has a green color which fluoridates under UV light. This can be seen for example under a fluorescence microscope to detect the location of the protein in the cell.

4 0
3 years ago
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