Question 1

Which of the following statements best describes the difference between the A, B, and Z forms of DNA?

Accepted Answer

The B form is the most common in cells, with about 10 base pairs per turn and a pitch of approximately 3.4 nm, while the Z form is left-handed and occurs under high salt conditions.

Question 2

Which histone proteins are found in the nucleosome core particle?

Accepted Answer

H2A, H2B, H3, H4

Question 3

What is the main function of messenger RNA (mRNA) in the cell?

Accepted Answer

It serves as the template for protein synthesis by conveying genetic information from DNA to the ribosome.

Question 4

Which of the following is a correct description of a covalent bond?

Accepted Answer

A bond formed by the sharing of electron pairs between atoms.

Question 5

Which amino acid contains a sulfur atom in its side chain and is essential for protein synthesis?

Accepted Answer

Methionine

Question 6

What type of bond stabilizes the secondary structure of proteins, such as alpha helices and beta sheets?

Accepted Answer

Hydrogen bonds

Question 7

Which of the following best explains why carbon is the most important element in organic molecules?

Accepted Answer

Carbon can form four covalent bonds, allowing for complex and diverse molecular structures.

Question 8

Which of the following is a correct representation of the peptide bond formation between two amino acids?

Accepted Answer

$\mathrm{R_1-COOH} + \mathrm{R_2-NH_2} \rightarrow \mathrm{R_1-CONH-R_2} + \mathrm{H_2O}$

Question 9

Which of the following statements about ribosomes is correct?

Accepted Answer

Ribosomes are composed of RNA and proteins and have two subunits.

Question 10

Which of the following is a correct description of a hydrogen bond?

Accepted Answer

A bond formed between a hydrogen atom covalently bonded to an electronegative atom and another electronegative atom.

Question 11

Which of the following is a function of transfer RNA (tRNA)?

Accepted Answer

tRNA recognizes codons on mRNA and brings the appropriate amino acid to the ribosome.

Question 12

Which of the following best describes the role of the anticodon loop in tRNA?

Accepted Answer

It recognizes and pairs with the complementary codon on mRNA.

Question 13

Which of the following amino acids is aromatic and can participate in hydrophobic interactions within proteins?

Accepted Answer

Phenylalanine

Question 14

Which of the following is a correct statement about the secondary structure of proteins?

Accepted Answer

It is stabilized by hydrogen bonds between backbone atoms.

Question 15

Which of the following is a correct description of the solenoid model of chromatin structure?

Accepted Answer

It describes the coiling of nucleosomes into a 30 nm fiber for higher-order chromatin packing.

Question 16

Which of the following is a correct formula for the structure of ATP?

Accepted Answer

$\mathrm{C_{10}H_{16}N_5O_{13}P_3}$

Question 17

Which of the following best explains the importance of hydrogen bonds in the structure of DNA?

Accepted Answer

Hydrogen bonds stabilize the double helix by connecting complementary base pairs.

Question 18

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

Accepted Answer

A molecule composed of a nitrogenous base, a pentose sugar, and a phosphate group.

Question 19

Which of the following best describes the difference between essential and non-essential amino acids?

Accepted Answer

Essential amino acids must be obtained from the diet, while non-essential amino acids can be synthesized by the body.

Biomolecules: Structure and Function – Nucleic Acids, Proteins, and Chemical Bonds

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