Question

1. What is the function of cholesterol in the cell membrane?

A. to allow substances to pass through

B. to prevent the hydrophobic tails from sticking together

C. to make more room inside the cell membrane

D. to help the cell recognize 'self' and 'non-self'


2. Which of the following is a function of the nucleus? SELECT ALL THAT APPLY

A.breaks down macromolecules into particles the cell can use

B. contains the information needed to make proteins

C. directs the activities of the cell

D. stores DNA

Answer 1

1. C. Cholesterol keeps the hydrophobic tails of the phospholipids on the cell membrane from being packed too tightly to increase fluidity.

2. B, C, D. The function of the nucleus is to house DNA away from the other parts of the cell and contains the genetic material to transcribe proteins. The specificity of the expression of certain parts of DNA to code for specific proteins indirectly allows the nucleus to direct the activities of the cell.