Question 1

Which of the following best describes the difference between an amine and an amide?

Accepted Answer

An amine contains a nitrogen atom bonded to one or more alkyl groups, while an amide contains a nitrogen atom bonded to a carbonyl group.

Question 2

Which of the following is a correct complementary DNA strand for the sequence 5'-GACTTCGACGGTACGAAT-3'?

Accepted Answer

3'-CTGAAGCTGCCATGCTTA-5'

Question 3

Which of the following statements about DNA replication is correct?

Accepted Answer

DNA replication is semi-conservative, meaning each new DNA molecule contains one old and one new strand.

Question 4

Which enzyme is responsible for adding nucleotides to a growing DNA strand during replication?

Accepted Answer

DNA polymerase

Question 5

What is the main function of tRNA during translation?

Accepted Answer

To bring amino acids to the ribosome and match them to the mRNA codon using its anticodon.

Question 6

Which of the following base pairs is correct in DNA?

Accepted Answer

Adenine with Thymine

Question 7

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

Accepted Answer

A phosphate group, a 5-carbon sugar, and a nitrogenous base

Question 8

Which of the following is a function of the enzyme topoisomerase during DNA replication?

Accepted Answer

It relaxes supercoiled DNA ahead of the replication fork.

Question 9

Which of the following is true about the difference between DNA and RNA?

Accepted Answer

DNA contains thymine, while RNA contains uracil.

Question 10

A mutation in which chromosome abnormality results in Down syndrome?

Accepted Answer

Trisomy 21

Question 11

Which of the following best explains why DNA is tightly coiled around histone proteins in the nucleus?

Accepted Answer

To condense the DNA so it fits in the nucleus and to regulate gene expression.

Question 12

Which of the following is the correct sequence of events in gene expression?

Accepted Answer

Transcription, then translation

Question 13

Which of the following codons signals the start of translation?

Accepted Answer

AUG

Question 14

Which of the following best describes the process of dehydration synthesis in the formation of a DNA strand?

Accepted Answer

It joins nucleotides together by removing a water molecule.

Question 15

Which of the following is a real-world example of an amine found in the human body?

Accepted Answer

Adenine in DNA

Question 16

Which of the following best describes the role of mRNA in protein synthesis?

Accepted Answer

It carries the genetic instructions from DNA to the ribosome for protein synthesis.

Question 17

Which of the following is a correct description of a gene?

Accepted Answer

A section of a chromosome that codes for a protein.

Question 18

Which of the following is a correct statement about Okazaki fragments?

Accepted Answer

They are short DNA fragments synthesized on the lagging strand during DNA replication.

Question 19

Which of the following best explains why mRNA is used as an intermediate in protein synthesis instead of DNA?

Accepted Answer

To protect the DNA from damage in the cytoplasm, since mRNA can be replaced if destroyed.

Question 20

Which of the following is a correct pairing of a chromosomal abnormality and its description?

Accepted Answer

Klinefelter syndrome: XXY

Amines, Amides, and Nucleic Acids: Structure, Function, and Biological Roles

Study Guide - Practice Questions