Question

question 23
proteins
a are structural materials.
b can function as enzymes.
c contain c, h, o, and n, and sometimes s.
d all of the above.

question 24
in a covalent bond
a one atom loses and another atom gains electrons.
b atoms share a pair or more of electrons.
c oppositely charged atoms attract.
d like - charged atoms repel.

last saved 10:28:43 am
questions filter (51)

Explanation:

Question 23

• Option A: Proteins like collagen are structural materials in the body.
• Option B: Many proteins (enzymes) act as biological catalysts.
• Option C: Proteins are made of amino acids which contain C, H, O, N, and sometimes S (e.g., cysteine).
• Since A, B, and C are all correct, the answer is D.

• Option A: Describes ionic bonding (electron transfer), not covalent.
• Option B: Covalent bonds involve atoms sharing electron pairs (e.g., in \( \ce{H2} \), two H atoms share a pair).
• Option C: Describes ionic attraction (between ions), not covalent bonding.
• Option D: Is a general electrostatic principle, not specific to covalent bonds. So the correct description of covalent bonds is B.

Answer:

D. all of the above.

Question 24