You are a doctor examining a patient's blood test reports. You are looking at the ratio of helper T cells and cytotoxic T cells. Helper T cells ___________; cytotoxic T cells __________. You can tell them apart by the type of protein they ____________
A. activate other immune system cells; kill
altered host cells; secrete
B. activate other immune system cells; kill
altered host cells; express on their plasma
membrane
C. kill altered host cells; activate other
immune system cells; secrete
D. kill altered host cells; activate other
immune system cells; express on their
plasma membrane
E. activate antigens; destroy antigens; digest
B
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A true breeding black rabbit is crossed with a true breeding white rabbit. If the black color trait is dominant, which of the following represents the expected phenotype of an F2 generation consisting of 8 individuals?
A. 8 black rabbits, 0 white rabbits, 0 grey rabbits B. 2 black rabbits, 2 white rabbits, 4 grey rabbits C. 0 black rabbits, 0 white rabbits, 8 grey rabbits D. 4 black rabbits, 2 white rabbits, 2 grey rabbits E. 6 black rabbits, 2 white rabbits, 0 grey rabbits
Archaea and bacteria are involved in which of the following cycles? (Select all correct choices.)
A. the nitrogen cycle B. the carbon cycle C. the sulfur cycle
All of the following represent anchoring junctions EXCEPT
A. tight junctions. B. focal adhesions. C. hemidesmosomes. D. desmosomes. E. adherens junctions.
Which statement about gene mutations is FALSE?
a. All mutations are transmitted to the next generation. b. Mutations are rare but their rates can be predicted. c. Mutations with beneficial effects will be favored by natural selection. d. Many mutations reduce an individual's chance of surviving and reproducing. e. Mutations with neutral effects neither help nor hurt the individual.