The function of nectar is
A. provision of carbohydrates for the plant.
B. attraction of pollinators.
C. preservation of delicate flower parts.
D. a sticky trap for parasitic insects.
E. prevention of desiccation.
B. attraction of pollinators.
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Which of the following are correct pairings of histone variants and their functions?
A. H3.3 ? stabilizes the open state (transcriptionally active) B. CENPA ? maintains kinetochore attachment C. H2AX ? DNA repair D. macroH2A ? X chromosome inactivation E. All of these choices are correct.
Purines and pyrimidines refer to the ________ of the DNA molecules.
A) nitrogenous bases B) sugar-phosphate backbone C) hydrogen bonds D) nucleus E) histones
Each of the following is an activity of RAD51 or the DNA with which it interacts except
A) RAD51 appears in cells at the time of recombination. B) RAD51 coats single-stranded DNA. C) RAD51-coated DNA interacts with double-stranded DNA. D) RAD51-coated DNA moves along target DNA until it finds a complementary sequence. E) All are RAD51 or RAD51-DNA activities.
The parasite (Leishmania/Toxoplasma/Trichomonas) is an obligate parasite that is incapable of surviving long outside the human host and is transmitted almost exclusively via sexual activity.
Fill in the blank(s) with the appropriate word(s).