How many amino acids are coded in the DNA segment:
CTC–ATA–CGA–TTC–AAG–TTA?
(a) 18
(b) 9
(c) 6
(d) 3

If a cell lacked ribosomes, it would not be able to

(a) Move

(b) Synthesize proteins

(c) Produce DNA

(d) Metabolize sugar

(e) Divide

When a cell is placed in a(n)___solution, the cell will lose water through osmosis. This process results in the___ of red blood cells

(a) hypotonic; crenation

(b) hypertonic; crenation

(c) isotonic; hemolysis

(d) hypotonic; hemolysis

List, in sequence, the phases of the interphase stage of the cell life cycle, and briefly describe what happens in each.

The sodium–potassium exchange pump

(a) Is an example of facilitated diffusion

(b) Does not require the input of cellular energy in the form of ATP

(c) Moves the sodium and potassium ions along their concentration gradients

(d) Is composed of a carrier protein located in the plasma membrane

(e) Is not necessary for the maintenance of homeostasis

Microvilli are found

(a) Mostly in muscle cells

(b) On the inside of plasma membranes

(c) In large numbers on cells that secrete hormones

(d) In cells that are actively engaged in absorption

(e) Only on cells lining the reproductive tract

Suppose that a DNA segment has the following nucleotide sequence:

CTC–ATA–CGA–TTC–AAG–TTA.

Which nucleotide sequences would a complementary mRNA strand have?

(a) GAG–UAU–GAU–AAC–UUG–AAU

(b) GAG–TAT–GCT–AAG–TTC–AAT

(c) GAG–UAU–GCU–AAG–UUC–AAU

(d) GUG–UAU–GGA–UUG–AAC–GGU