When a presented antigen fragment interacts with the T cell receptor of a helper T cell, the co-receptor that must also participate to finalize recognition is ________.
A. MHC I
B. CD8
C. CD4
D. All of the choices are correct.
Answer: C
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Crossing over creates new ________
a. combinations of alleles b. alleles c. zygotes d. chromosomes
Greenhouse gases are associated with all except:
a. global warming. b. coral bleaching. c. cooling of Arctic waters. d. sea level rise. e. melting of glaciers.
Which group of land plants is most restricted to moist environments?
A) Vascular plants B) Bryophytes C) Tracheophytes D) Anthophyta E) Angiosperms
The apprentice in your horticulture lab accidentally trims all of the axillary buds from a particularly prized specimen. After realizing his mistake, he rather glumly asks you, as lead horticulturalist, about the effects on the plant. You predict that
A. the plant will continue its horizontal spread and will be a wide but short variety. B. the plant will regrow the lost buds. C. the plant will die rapidly from this loss. D. the plant will continue its vertical growth and will be a tall and skinny variety.