What is the function of the proboscis in nemerteans?
a. attracting mates
b. capturing food
c. sensing predators
d. expelling wastes
b. capturing food
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An individual who responds to walking into an obstruction by pushing into it harder is exhibiting
(a) negative phototaxis. (b) positive geotaxis. (c) negative thigmotaxis. (d) positive thigmotaxis.
Which polymer serves as the information storage (genetic material) molecule for cells?
Gram-negative bacteria are characterized by the presence of a gram-negative envelope. Which of the following are components of this envelope?
A) The plasma membrane, outer membrane and periplasm. B) The plasma membrane and the outer membrane, peptidoglycan layer and periplasm. C) The outer membrane, peptidoglycan and periplasm. D) The plasma membrane, peptidoglycan and the outer membrane.
Which of the following is a characteristic of a bacteriophage?
A. Is a naked virus B. Is the most common cause of the common cold C. Has a spiked protein coat D. Infects animals E. Has a lipid envelope