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7. each of the following is true of rna except a. rna contains deoxyrib…

Question

  1. each of the following is true of rna except

a. rna contains deoxyribose.
b. rna contains a phosphate group.
c. rna is single - stranded.
d. rna contains uracil.

  1. which of the following are found in both dna and rna?

a. ribose, phosphate groups, and adenine
b. deoxyribose, phosphate groups, and guanine
c. phosphate groups, guanine, and cytosine
d. phosphate groups, guanine, and thymine

  1. the diagram below shows the key steps for making proteins. use the diagram to answer the following question(s).

diagram of cell and protein synthesis steps
according to the diagram, in which step is messenger rna being constructed?
a. i
b. ii
c. iii
d. iv

  1. which of the following statements about translation is true?

diagram of protein synthesis
a. it is the process in which base - pairs are matched with nucleotides in dna.
b. it is the process in which proteins are made in ribosomes according to instructions in messenger rna.
c. it is the process in which part of the nucleotide sequence of dna is copied into rna.
d. none of the other answer choices

Explanation:

Response
Question 7
Brief Explanations

To solve this, we analyze each option:

  • Option a: RNA has ribose, not deoxyribose (DNA has deoxyribose). So this is false.
  • Option b: RNA (like DNA) has a phosphate group. True.
  • Option c: RNA is single - stranded. True.
  • Option d: RNA contains uracil (DNA has thymine). True.

Since the question asks for what is NOT true of RNA, the answer is a.

Brief Explanations

We compare the components of DNA and RNA:

  • DNA has deoxyribose, phosphate, and bases (A, T, G, C). RNA has ribose, phosphate, and bases (A, U, G, C).
  • Option a: DNA does not have ribose. Eliminate.
  • Option b: RNA does not have deoxyribose. Eliminate.
  • Option c: Phosphate groups, guanine, and cytosine are in both (DNA: G, C; RNA: G, C; both have phosphate). Correct.
  • Option d: RNA does not have thymine. Eliminate.
Brief Explanations

Messenger RNA (mRNA) is made during transcription, which is the process of copying DNA into RNA. In the diagram:

  • Step I: Likely DNA in its normal state.
  • Step II: Shows the process of transcribing DNA to mRNA (one strand of DNA is used to make mRNA).
  • Step III: DNA re - forming its double helix.
  • Step IV: Translation (protein synthesis at ribosome).

So mRNA is constructed in step II.

Answer:

a. RNA contains deoxyribose.

Question 8