Which of these parts of the cell membrane are polar and allow the cell to

exist in water?

O

A. Phosphate groups

O

B. Amino acid chains

O

C. Fatty acid chains

D. Globular proteins

O

When is the lac operon most active? A: when glucose levels are high and lactose is present. B:when glucose levels are low and lactose is absent. C: when glucose levels are low and lactose is present.

Pollen is carried from one flowering plant to another by

What controls what enters and exits the cell to maintain homeostasis?

Which mode of reproduction is exhibited by frogs A. viviparous B. Oviparous C. Ovoviviparous

True or False Spores can be produced by some protists as a response to harsh conditions in their enviroment.

Another name for brucellosis isA. blackwater feverB. rabbit feverC. undulant feverD. snail feverE. Yellow fever

For an enzyme catalyzed reaction at equilibrium, what is the K if the concentrations of product is 0.5 mM and concentration of substrates are 6.5 mM and 3.0 mM? a) 3.9x 10 b) 2.56 x 10 c) 167 d) 25.6 e) 2560

Why is circulation in humans called closed double circulation?

Mutations that are passed on off to offspring must occur in

What is needed for translation to occur? Check all that apply O mRNA o ribosome tRNA O codons DONE