Eukaryotic chromosomes are composed of a complex of 60% protein and 40% DNA. This complex is referred to as:
A. Chromatin
B. Cohesin
C. The histone complex
D. The kinetochore
Answer: A
Biology & Microbiology
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Stomata generally close in response to ____
a. the release of abscisic acid by the roots b. a drop in CO2 concentration in leaf air spaces c. exposure to red light d. a drop in O2 concentration in leaf air spaces e. an increase in CO2 concentration in the leaf air spaces
Biology & Microbiology
The nitrogen cycle on land begins with
a. nitrification. b. denitrification. c. decomposition. d. uptake by producers. e. nitrogen fixation
Biology & Microbiology
Aquaporins are specific channel proteins that allow for the movement of ______ across a selectively permeable membrane
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
Placoid scales are found on:
a. lungfish. b. sharks. c. ray-finned fish. d. lob-finned. e. snakes.
Biology & Microbiology