In order for crustacean molting to occur, ____ secretion must ____
a. molt-inhibiting hormone; increase
b. juvenile hormone; be inhibited
c. prothoracicotropic hormone; decrease
d. ecdysone; increase
e. insulin-like hormone; increase
ANSWER: d
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Epigentic mechanisms of gene regulation ____ and are ____
A. can be inherited by daughter cells; permanent B. can be inherited by daughter cells; often reversible and responsive to environmental change C. can be inherited by daughter cells; random with respect to the environment D. are not inherited by daughter cells; reversible and responsive to environmental change E. are not inherited by daughter cells; permanent
Which of the following is least likely to be part of a cell membrane?
A) peptidoglycans B) phospholipids C) glycoproteins D) transport proteins E) enzymes
Multi-partner associations consisting of a particular fungi and photosynthetic green algae and /or cyanobacteria are called
a. endophytes b. symbiophytes c. crustophytes d. fruticophytes e. lichens
The presence of DNA is important for cellular metabolic activities because DNA
a. directs the production enzymes b. is a structural component of cell membrane c. directly increases the solubility of nutrients d. is a major component of the cytoplasm