Many plants flower in response to day-length cues. Which of the following statements best summarizes this phenomenon?
A) As a rule, short-day plants flower in the summer.
B) As a rule, long-day plants flower in the spring or fall.
C) Long-day plants flower in response to long days, not short nights.
D) Flowering in short-day and long-day plants is controlled by phytochrome.
D
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Which animal group does not have tissues?
a. nematodes b. sponges c. echinoderms d. flatworms e. cnidarians
The stage of meiosis that makes descendant cells haploid is _____
a. prophase I b. prophase II c. anaphase I d. anaphase II e. metaphase I f. metaphase II
The diffusion of water across a selectively permeable (biological) membrane is
A. a rare occurrence. B. active transport. C. a process that always requires proteins. D. always beneficial to a cell. E. osmosis.
What is the cause of Tay—Sachs disease?
What will be an ideal response?