1. the nucleus
a. contains nuclear pores
b. regulates cellular activities
c. stores genetic material
d. a and b
e. a, b and c
2. which of the following organelles functions in lipid biosynthesis?
a. lysosome
b. smooth er (my answer)
c. peroxisome
d. rough er
3. viruses are
a. eukaryotic
b. prokaryotic
c. eukaryotic and prokaryotic
d. neither
4. the large central vacuole
a. contributes to buoyancy in bacteria
b. maintains turgor pressure in plants
c. digests foodstuff in animals
d. regulates osmosis in protists

1. E. A, B, and C

2. B. Smooth ER

3. D. Neither

4. B. Maintains turgor pressure in plants

Explanation:

1. Though I've never heard of "nuclear pores" in the nucleus (I've only known of them to be in the nuclear envelope), answer E is the only one that has the most obvious answer--storing genetic material. The nucleus regulates cell activities by using the stored genetic material to produce proteins.

2. There's no explanation for this as it's pretty much just memorizing the function of organelles, just remember that "lipid biosynthesis" is just basically saying "making lipids".

3. Viruses are neither eukaryotic or prokaryotic since they have no defining characteristics that eukaryotic and prokaryotic cells have. They lack a nucleus and can only replicate when inside a host cell.

4. The words "large central vacuole" should give you a big hint to the question talking about a plant cell. Turgor pressure is when the cell walls of plant cells press up against each other due to the size of the large central vacuole. This is why plants wilt when they do not have enough water, their cell walls do not press against each other so the structure is weak.