Exchange of segments between nonsister chromatids of a bivalent during meiosis.
What will be an ideal response?
Crossing-over
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Bark is mainly _____
a. periderm and cork c. periderm and phloem b. cork and wood d. cork cambium and phloem
Most aquatic animals excrete ammonia, whereas land animals excrete urea or uric acid. What is the most likely explanation for this difference?
a. They have different diets. b. Land animals can get the energy needed to make urea or uric acid. c. Ammonia is very toxic, and it takes a lot of water to dilute it. d. Land animals cannot afford the energy needed to make ammonia. e. Fish need to get rid of ammonia, but land animals need it to live.
The complementary base pairs in a DNA molecule are stabilized by:
A) ionic bonds. B) a salt bridge. C) hydrogen bonds. D) covalent bonds. E) the electrostatic interactions of the charged backbone
In animal cells, what structure is homologous to plasmodesmata?
a. desmosome b. tight junction c. gap junction d. proteoglycan