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

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology