Why are native plants important for butterfly populations?
a. Larvae often will not eat non-native plants
b. Adult butterflies will not eat nectar from non-native plants
c. Pupae cannot hang properly from non-native plants
d. All of the above
Answer: a. Larvae often will not eat non-native plant
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Nitric oxide is a signal molecule that can
a. bind to surface receptors and activate second messengers. b. bind to surface receptors and open ion channels. c. diffuse across cell membranes and bind to receptors that regulate transcription. d. diffuse across cell membranes and directly alter the activity of intracellular enzymes.
Hexokinase is an enzyme that binds specifically to glucose and converts it into glucose 6-phosphate. The activity of hexokinase is suppressed by glucose 6-phosphate, which binds to hexokinase at a location that is distinct from the active site. This is an example of what?
A. cofactor binding B. competitive inhibition C. allosteric activation D. feedback inhibition
Electron microscopes use what to focus the beam of electrons?
a. electromagnets b. a condenser lens c. light rays d. X-ray diffraction e. glass
Human herpesvirus 4 (EBV) is implicated in which of the following diseases?
A) Hodgkin's lymphoma B) cervical cancer C) oral hairy leukoplakia D) chronic fatigue syndrome E) Hodgkin's lymphoma, chronic fatigue syndrome, and oral hairy leukoplakia