BIOLOGY HIGH SCHOOL

Which best describes a difference between transcription and DNA replication?A. DNA replication produces mRNA.
B. They use different nucleotide bases.
C. Transcription does not use DNA.
D. Only DNA replication happens in the nucleus.

Answers

Answer 1
Answer:

Ans. (B). They use different nucleotide bases.

DNA replication involves synthesis of DNA molecules, while transcription is a process that involves synthesis of RNA molecules. In both processes, DNA acts as template and provides information for synthesis of new daughter DNA or RNA strand.

Process of replication and transcription differs from each other as each process uses different nucleotide bases. This is because, nucleotide bases in DNA include adenine, guanine, cytosine, and thymine, while in RNA uracil is present instead of thymine along with three similar bases.

Thus, the correct answer is option (B).

Answer 2
Answer: The answer is: [B]:  They use different nucleotide bases.
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Specifically, DNA replication uses thymine; whereas transcription uses uracil.
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Explanation:

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Answers

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Answers

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When Gregor Mendel crossed true-breeding tall plants with true-breeding short plants, why was it impossible to observe segregation? A. Alleles for height do not segregate in the F2.

B. Alleles segregate only in the F2 generation.

C. Alleles segregate best when two tall plants are crossed.

D. Alleles in the F1 must be Tt to have height variety in the F2.

Answers

When Gregor Mendel crossed true-breeding tall plants with true-breeding short plants, it was impossible to observe segregation because D) alleles in the F1 must be Tt to have height variety in the F2.

Answer:

Alleles in the F1 must be Tt to have height variety in the F2.

Explanation:

  • The law of segregation given by Mendel states that the pair of an allele for a given gene separate during the formation of gametes and then these gametes fuse randomly with each other during fertilization to determine the genotype of the individual.
  • Therefore, for a pure breeding tall plant, the alleles would form two gametes each having the allele T and for a pure breeding small plant, each of the gametes will have allele t.
  • Therefore, the only possible combination from TT X tt would be Tt and thus, segregation is not observed.
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