Bromthymol blue (BTB) is colored below pH 6.0 and colored above pH 7.6
(a) blue, yellow.
(b) yellow, green.
(c) red, blue.
(d) yellow, blue.
(d) yellow, blue.
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Which of the following transcription factors is present at the highest concentration in the eve stripe 2 region of the fruit fly?
A. bicoid B. Hunchback C. Krüppel D. Giant
Reznick and Endler were interested in the effects of
__________ on guppy evolution. a. predation b. competition c. population density d. density-independent factors e. mating rituals
Steroid hormones act by
a. interacting with a target cell's DNA. b. activating mitochondria in target cells. c. acting on ribosomes for protein synthesis. d. stimulating mitosis. e. helping glucose into the target cell.
Angiosperms are most closely related to _____.
a) bryophytes b) seedless vascular plants c) green algae d) gymnosperms e) charophyceans