How many electrons are shared in a double covalent bond?
a. Two pairs
b. Four pairs
c. One pair
d. Electrons are not shared in covalent bonds
e. Three pairs
a
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Auxin concentration gradients
a. appear once germination begins. b. promote the transcription of an enzyme that breaks down cytokinin. c. allow formation of plant parts in expected patterns. d. help young cells elongate so that shoots and roots lengthen. e. are described by all of these EXCEPT "appear once germination begins."
What situation below is best characterized as interference competition?
A. Cattle and deer grazing on the same grasses. B. Viruses that infect bird species. C. A barnacle living on the tail of a humpback whale. D. Insects that use rabbit warrens for shelter. E. A tiger that excludes other tigers from its territory.
When body temperature is too low, which of the following occurs?
A) Blood vessels in the skin constrict. B) Muscles relax. C) Sweat glands are activated. D) Blood vessels at the body surface dilate and fill with blood.
An expected meiotic pairing configuration in a ________ would be a trivalent
A) monosomic individual B) diploid C) triploid D) trisomic individual E) monoploid