Unlike the cell membrane, the cell wall is

a

selectively permeable.

b

composed of a lipid bilayer.

c

found in all organisms.

d

a rigid structure.

The liquid part of the cell; contains organelles and dissolved nutrients and salts

Which statement regarding protein structure is true? Van der Waals interactions are insignificant. Hydrophilic side chains are never found in the interior. Hydrophobic side chains are usually in the interior of the native structure.

In the most recent classification system, Bacteria, Archaea, and Eukarya are the three major what of life

Which category would a mouse fall into on the energy pyramid? a. primary consumer b. primary producer c. secondary consumer d. tertiary consumer

In muscle tissue, the activity of glycogen phosphorylase b is allosterically controlled with a. ATP acting as a positive effector and glucose 6‑phosphate acting as a negative effector. b.

Any statements about optimal population are inevitably culturally determined. a. True b. False

How do body systems work?

The carbon dioxide that we exhale is produced by what process? A. Calvin cycle B. Glycolysis C. Krebs cycle D. Photosynthesis

Is cell mediated or humoral immunity essential to control a mycobacterium infection?

A frog lays thousands of eggs because many eggs die. This behavior is an example of a) competition b) overproduction c) variation in a population d) survival of the fittist