Question 1

Which of the following best describes the structure of a DNA nucleotide?

Accepted Answer

A phosphate group, a deoxyribose sugar, and a nitrogenous base

Question 2

During DNA replication, what does 'semi-conservative' mean?

Accepted Answer

Each new DNA molecule contains one old and one new strand

Question 3

Which of the following base pairs is correct in DNA?

Accepted Answer

Cytosine (C) pairs with Guanine (G)

Question 4

Which process is responsible for converting the genetic code in DNA into a complementary mRNA sequence?

Accepted Answer

Transcription

Question 5

What is the main difference between the sugars in DNA and RNA?

Accepted Answer

DNA contains deoxyribose, RNA contains ribose

Question 6

Which of the following statements about the central dogma of molecular biology is correct?

Accepted Answer

Genetic information flows from DNA to RNA to protein

Question 7

If a DNA strand has the sequence 5'-ATCGGTA-3', what is the complementary DNA strand?

Accepted Answer

3'-TAGCCAT-5'

Question 8

Which type of RNA carries amino acids to the ribosome during translation?

Accepted Answer

tRNA

Question 9

During translation, what is the function of the anticodon on tRNA?

Accepted Answer

It binds to the corresponding mRNA codon

Question 10

Which of the following best explains why a mutation in DNA can affect protein function?

Accepted Answer

Mutations can change the mRNA sequence, leading to a different amino acid sequence in the protein

Question 11

Which of the following is NOT a difference between DNA and RNA?

Accepted Answer

DNA contains ribose, RNA contains deoxyribose

Question 12

A scientist is studying a molecule with the following characteristics: single-stranded, contains uracil, and has ribose sugar. What is this molecule?

Accepted Answer

RNA

Question 13

Which of the following best describes the role of rRNA in the cell?

Accepted Answer

It forms the core structure of the ribosome and catalyzes peptide bond formation

Question 14

If the mRNA codon is 5'-AUG-3', what is the corresponding tRNA anticodon?

Accepted Answer

3'-UAC-5'

Question 15

Which phase of translation involves the ribosome moving along the mRNA and the growing polypeptide chain elongating?

Accepted Answer

Elongation

Question 16

A patient has a genetic disorder caused by a single base substitution in a gene. Which process most directly leads to the production of an abnormal protein?

Accepted Answer

Transcription and translation

Question 17

Which of the following sequences is a possible mRNA transcript from the DNA template strand 3'-TACGGTACG-5'?

Accepted Answer

5'-AUGCCAUGC-3'

Question 18

Which of the following best explains why proteins are considered the 'workhorses' of the cell?

Accepted Answer

They perform most cellular functions and determine physical traits

Question 19

Which of the following is the correct order of events in the central dogma?

Accepted Answer

DNA → RNA → Protein

Question 20

A mutation changes a codon in mRNA from UAU (tyrosine) to UAA. What is the most likely result?

Accepted Answer

The protein will terminate early due to a stop codon

DNA, RNA, and Protein Synthesis: A Comprehensive Study Guide

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