Watson and Crick are usually given credit for discovering that DNA has a ____________ shape.
Fill in the blank(s) with the appropriate word(s).
Answer: double helix
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An organism has one Z chromosome and one W chromosome. That organism is
A. a female bird. B. a male bird. C. a female insect. D. a male insect. E. a male or female human.
In the embryonic development of flowering plants, the basal cell develops into the:a
apical cell. b. apical meristem. c. suspensor. d. integuments. e. endosperm.
After responding to complement, the main function of dendritic cells is to present antigen to which cells in an adaptive immune response?
A. Mast cells B. Basophil C. B cells D. NK cells E. T cells
Of the four main tissue types, the type known as ________ covers body surfaces and lines body cavities and organs
Fill in the blank(s) with correct word