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Umnica [9.8K]
3 years ago
12

Before replication can take place.(1) A. DNA polymerases must add complementary nucleotides to DNA. B. the two strands of DNA mu

st separate. C. the covalent bonds in DNA must break. D. helicases must break the bonds in the nucleotides.
Biology
1 answer:
andriy [413]3 years ago
4 0

Answer:

The correct answer is B. the two strands of DNA must separate.

Explanation:

DNA is a double-stranded structure. The two strands are joined together by the formation of hydrogen bonds between complementary nucleotides. So before the replication takes place these two strands must be separated.

The separation of DNA strand is accomplished by the action of a helicase enzyme which breaks the hydrogen bond between complementary nucleotides and separated the two DNA strands.  

After separation, the DNA polymerase binds to separated DNA and replicating the DNA. So the right answer is B.

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Match the activities to the respective category.
ivann1987 [24]

Answer:

Carbon and Its Compounds: Ethane, carbohydrates, diamond

Oxygen and Its Compounds: Ozone, water

Explanation:

Carbon and its compounds refers to compounds that has carbon atoms in them whether they exist in nature or are made artificially. Examples include

- Ethane, C2H6

- Carbohydrates, Cx(H2O)y

- Diamond, an allotrope of carbon

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- Ozone, O3 an allotrope of oxygen found in the upper part of the atmosphere

- water, H2O

7 0
4 years ago
The cilia and flagella of eukaryotic cells are composed of _____. the cilia and flagella of eukaryotic cells are composed of ___
Vladimir [108]
<span>The cilia and flagella of eukaryotic cells are made up of specifically designed microtubules. Microtubules are part of the cytoskeleton and are nucleated. They play an vital role in several cellular processes and also play a part in maintaining a cell's structure.</span>
3 0
3 years ago
A particular plant has 10 pairs of chromosomes in each cell. For each of the plant's gametes, how many genetic combinations are
Law Incorporation [45]

Answer:

C. 1,024

The answer can be worked out using 2^pairs of chromosomes

Explanation:

Imagine there were <u>two</u> pairs of chromosomes:

  • A paired with B
  • C paired with D

A gamete could have the following combinations:

  • A + C
  • A + D
  • B + C
  • B + D

Therefore, with two pairs of chromosomes, there are 4 (2²) possibilities

Now, Imagine there were <u>three</u> pairs of chromosomes:

  • A paired with B
  • C paired with D
  • E paired with F

A gamete could have the following combinations:

  • A + C  + E
  • A + D + E
  • A + D + F
  • A + C + F
  • B + D + F
  • B + C + F
  • B + C + E
  • B + D + E

Therefore, with three pairs of chromosomes, there are 4 (2³) possibilities

For 10 chromosomes - there are 2¹⁰ possibilities. 2¹⁰ = 1024

3 0
4 years ago
Mutations and sexual reproduction aid evolution by providing ..
horsena [70]
The answer C the theory of evolution
7 0
4 years ago
Rna polymerases carry out transcription at much lower rates than dna polymerases carry out replication. Why is greater efficienc
elena-14-01-66 [18.8K]

Answer:

DNA polymerase is responsible for the catalysis of the replication of a vast region of DNA and the efficiency/speed of the replication is necessary to complete the replication process swiftly.

Explanation:

The difference between replication and transcription, is that in the replication process the DNA is making more copies of itself and in transcription, the DNA is being copied into RNA. DNA replication occurs in preparation for cell division, and transcription occurs in preparation for protein translation

8 0
3 years ago
Read 2 more answers
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