What are the genes that code for positive cell-cycle regulators, like Cdk, called?
a. oncogenes
b. tumor suppressor genes
c. proto-oncogenes
d. mutated genes
c. proto-oncogenes
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HIV typically attaches to
A. protein A. B. C3b. C. C5a. D. CD4.
California's native golden trout declined after European brown trout and eastern brook trout were introduced into California's mountain streams for sport fishing. This is an example of what type of threat?
a. overharvesting b. commercial sporting c. invasive species d. endemic species e. habitat destruction
The only endocrine gland whose secretory function is under direct control by sympathetic nerves is the
a. pancreas. b. thyroid. c. adrenal medulla. d. thymus. e. testis.
In leaf cutter ant colonies, the ants clip leaves to feed a fungus garden and then the ants feed on the fungus. Is this a mutualistic relationship?
A. Yes, the ants and the fungus are engaged in a mutually beneficial symbiotic relationship. B. No, the ants are leaf parasites but have no relationship with the fungus. C. No, the ants are parasites on both the leaves and fungus. D. Yes, the ants and the trees are in a mutualistic relationship.