Question

1. what is the main function of the nucleus?

a. break down waste
b. store genetic information and control cell activities
c. produce proteins
d. transport materials

1. what is the main function of the mitochondria?

a. make sugar
b. produce energy (atp) for the cell
c. transport proteins
d. store dna

1. what is the main function of ribosomes?

a. make lipids
b. break down toxins
c. make proteins
d. make energy

1. which of the following describes a prokaryotic cell?

a. has a nucleus
b. contains membrane - bound organelles
c. has dna floating freely in the cytoplasm
d. is always multicellular

1. which of the following describes a eukaryotic cell?

a. has no nucleus
b. has a nucleus that stores dna
c. never has membrane - bound organelles
d. always has a cell wall

1. humans are:

a. prokaryotes
b. eukaryotes
c. both
d. neither

1. bacteria are:

a. prokaryotes
b. eukaryotes
c. viruses
d. fungi

Explanation:

• Question 22: The nucleus stores genetic information (DNA) and controls cell activities. Other options: Lysosomes break down waste (A is wrong). Ribosomes produce proteins (C is wrong). Vesicles transport materials (D is wrong).
• Question 23: Mitochondria produce energy (ATP) for the cell. Chloroplasts make sugar (A is wrong). Vesicles transport proteins (C is wrong). Nucleus stores DNA (D is wrong).
• Question 24: Ribosomes make proteins. Smooth endoplasmic reticulum makes lipids (A is wrong). Peroxisomes break down toxins (B is wrong). Mitochondria make energy (D is wrong).
• Question 25: Prokaryotic cells have DNA floating freely in the cytoplasm. They lack a nucleus (A is wrong) and membrane - bound organelles (B is wrong). Most prokaryotes are unicellular (D is wrong).
• Question 26: Eukaryotic cells have a nucleus that stores DNA. Prokaryotes have no nucleus (A is wrong). Eukaryotes have membrane - bound organelles (C is wrong). Not all eukaryotes (like animal cells) have a cell wall (D is wrong).
• Question 27: Humans are eukaryotes as their cells have a nucleus and membrane - bound organelles.
• Question 28: Bacteria are prokaryotes. They lack a nucleus and membrane - bound organelles. Viruses are not cells (C is wrong). Fungi are eukaryotes (D is wrong).

Answer:

1. B. Store genetic information and control cell activities
2. B. Produce energy (ATP) for the cell
3. C. Make proteins
4. C. Has DNA floating freely in the cytoplasm
5. B. Has a nucleus that stores DNA
6. B. Eukaryotes
7. A. Prokaryotes