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 molecules is a primary amine?

Accepted Answer

CH\_3NH\_2

Question 3

What type of bond forms between the nitrogenous bases adenine and thymine in DNA?

Accepted Answer

Hydrogen bonds

Question 4

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

Accepted Answer

3'-CTGAAGCTGCCATGCTTA-5'

Question 5

During DNA replication, which enzyme is responsible for unwinding the DNA double helix?

Accepted Answer

DNA helicase

Question 6

Which of the following best explains why DNA replication is described as 'semi-conservative'?

Accepted Answer

Each new DNA molecule consists of one original strand and one newly synthesized strand.

Question 7

Which of the following is NOT a function of DNA in the cell?

Accepted Answer

Catalyzing metabolic reactions

Question 8

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 9

Which of the following statements about the directionality of DNA strands is correct?

Accepted Answer

The two strands of DNA run antiparallel, with one strand running 5' to 3' and the other 3' to 5'.

Question 10

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

Accepted Answer

mRNA can leave the nucleus and be translated in the cytoplasm, protecting DNA from damage.

Question 11

Which of the following is the correct base pairing in RNA during transcription?

Accepted Answer

A pairs with U, C pairs with G

Question 12

Which of the following best describes the role of tRNA during translation?

Accepted Answer

tRNA brings specific amino acids to the ribosome according to the codon sequence on mRNA.

Question 13

A mutation causes a non-disjunction event during meiosis, resulting in a zygote with three copies of chromosome 21. What is the most likely outcome?

Accepted Answer

The individual will have Down syndrome (Trisomy 21).

Question 14

Which of the following best describes the process of dehydration synthesis in the formation of a peptide bond?

Accepted Answer

A water molecule is removed as two amino acids are joined by a covalent bond.

Question 15

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

Accepted Answer

It joins Okazaki fragments on the lagging strand.

Question 16

Which of the following best explains why most aneuploidies are incompatible with life?

Accepted Answer

Aneuploidies disrupt the normal balance of gene expression, leading to severe developmental problems.

Question 17

Which of the following is a correct statement about the genetic code?

Accepted Answer

Each codon in mRNA consists of three nucleotides and codes for one amino acid.

Question 18

Which of the following best describes the role of the ribosome during translation?

Accepted Answer

It facilitates the binding of tRNA anticodons to mRNA codons and catalyzes peptide bond formation.

Question 19

Which of the following is a real-world example of a polymer containing amide bonds?

Accepted Answer

Kevlar

Question 20

Which of the following best explains why hydrogen bonding is important in the structure of DNA?

Accepted Answer

Hydrogen bonds hold the two strands of DNA together by connecting complementary nitrogenous bases.

Amines, Amides, and Nucleic Acids: Structure, Function, and Genetic Information

Study Guide - Practice Questions