Question

1. what is the main function of enzymes?

a) to build cell membranes
b) to speed up chemical reactions
c) to store genetic information
d) to transport oxygen in the blood

1. what type of bond holds the primary structure of a protein together?

a) disulfide bonds
b) peptide bonds
c) ionic bonds
d) hydrogen bonds

1. which of the following is a function of membrane proteins?

a) provide structural support for the cell
b) serve as enzymes
c) transport molecules across the membrane
d) all of the above

1. which organelle is responsible for energy production in a cell?

a) golgi apparatus
b) ribosome
c) mitochondrion
d) nucleus

1. what is the main function of the cell nucleus?

a) to produce proteins
b) to regulate water balance
c) to generate atp
d) to store the cells genetic material

Explanation:

• For question 43: Enzymes are biological catalysts that increase the rate of chemical reactions. Building cell - membranes is mainly the function of lipids, storing genetic information is for nucleic acids, and transporting oxygen in the blood is the role of hemoglobin.
• For question 44: The primary structure of a protein is held together by peptide bonds formed between amino acids during translation. Disulfide bonds are involved in higher - order protein structures, ionic bonds and hydrogen bonds also contribute to higher - order structures rather than the primary structure.
• For question 45: Membrane proteins can provide structural support, act as enzymes, and transport molecules across the membrane.
• For question 46: Mitochondria are the power - houses of the cell and are responsible for energy production through processes like cellular respiration. The Golgi apparatus is involved in modifying, sorting, and packaging proteins and lipids, ribosomes are for protein synthesis, and the nucleus contains genetic material.
• For question 47: The main function of the cell nucleus is to store the cell's genetic material (DNA). Protein production occurs in ribosomes, water balance regulation is not the main function of the nucleus, and ATP generation mainly occurs in mitochondria.

Answer:

1. b) To speed up chemical reactions
2. b) Peptide bonds
3. d) All of the above
4. c) Mitochondrion
5. d) To store the cell's genetic material