Body size can be significantly altered in individuals with hormonal disorders; too much growth hormone (GH) prior to puberty causes ________
a. poor growth, and is termed pituitary dwarfism
b. long, spindly limbs, a condition called Marfan's syndrome
c. acromegaly, excessive growth of the hands and feet
d. gigantism, a normally proportioned but very large body
d
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The cells that function in phloem are:
a. vessels b. sieve elements c. adjunct cells d. sclereids e. periderm
The fitness of an individual is measured by
A) the proportion of heterozygous alleles within its genome. B) its body size. C) its efficiency in obtaining energy. D) the proportionate contribution it makes to future generations.
In mammals, the master clock is located in the:a
pineal gland. b. suprachiasmatic nucleus. c. crepuscular gland. d. biological clock. e. pituitary gland.
A woody plant lives through 5 years of drought, followed by 5 years of good growing conditions. The ring of xylem cells formed during the 5 good years will
A) be thicker than those formed during the drought years. B) be living, whereas those formed during the drought years will be dead. C) be thinner than those formed during the drought years. D) conduct a higher ratio of sugar to water than those formed during the drought years.