Question

1. A. In order to translate DNA into peptides Nature uses codons that contain how many bases?

1

2

4

5

B. The major forces/bonds that holds phospholipid membranes together is _________________.

van der Waal forces

electrostatic interactions

electrostatic interactions

disulfides

covalent bonds

C. Which of the following is not a role that proteins play?

Act as nutrients when taken in as a food source

Catalyze reactions

Form membranes

Allow organisms to move (muscles)

D. Biological membranes are semi-permeable. One of the major groups that do not cross are _______________.

Gasses

Cholesterol

Charged ions

Water

E. Which of the following secondary structural elements requires inter-chain hydrogen bonding?

Beta-sheets

Beta-turns

Random coils

Disulfide bonds

Answer 1