Spiders breathe by means of
a. Gills
b. Diffusion across the soft cuticle
c. An extensive system of tracheae more complex than is found in insects
d. Book lungs or primitive tracheae
e. Coxal glands
Answer: e. Coxal glands
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When a neuron membrane potential becomes less negative it becomes
a. depolarized. b. hyperpolarized. c. repolarized. d. damaged. e. activated above the threshold potential.
The human immunodeficiency virus first attacks
a. helper T cells. b. B cells. c. dendritic cells. d. cytotoxic T cells. e. macrophages.
Why does a person continue to breathe heavily after prolonged activity?
A) no reason B) to relieve fatigue C) because of lack of water D) to relieve O2 debt
Which statement is true regarding endospores and sporulation?
a. The three steps of sporulation are activation, germination, and outgrowth. b. Endospores readily take up stain and thus are often seen as stained circles within vegetative cells. c. Calcium complexed with dipicolinic acid helps to dehydrate a developing endospore. d. Sporulation is a type of reproduction and is an alternative to binary fission.