A hormonal signal is detected by ____
a. chloroplasts
b. transport proteins
c. receptor proteins
d. statoliths
e. plasma membranes
ANSWER: c
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Components typical of plant cells but not of animal cells are
(a) nuclei. (b) cell walls. (c) mitochondria. (d) ribosomes.
Why is it not surprising that AIDS patients frequently suffer a viral-induced tumor?
A. HIV genomes integrate into the host cell chromosome. This integration might result in loss of control of the cell cycle (also known as cancer). B. The immune system's CD4+ T cells are directly responsible for elimination of tumor cells. HIV attacks them and eliminates them, making a person more susceptible to cancer. C. The therapies for HIV are highly mutagenic, which may lead to cancerous states in people taking the drug regimen. D. Products of an active HIV infection are highly mutagenic-so, as a person's illness progresses, these mutagenic compounds build up and are more capable of inducing a cancerous state.
Suppose you discover a new species of animal that does not have body segments, but is triploblastic, eucoelomate, and cephalized. Under the molecular phylogenetic scheme, you would allocate it to which phylum?
A. Mollusca. B. Echinodermata. C. Nematoda. D. Platyhelminthes. E. Arthropoda.
All of the following are arachnids EXCEPT:
a. horseshoe crabs. b. mites. c. scorpions. d. ticks. e. spiders.