Chorionic villus sampling reveals that a fetus has the karyotype 45, X. What is the diagnosis?
A) Normal male
B) Klinefelter syndrome
C) Turner syndrome
D) Down syndrome
C) Turner syndrome
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The system of communication between cells through signaling pathways is called homeostasis
a. True b. False
Parental care of offspring:a
for many animals has a lower cost than benefit. b. results in a decreased probability that each offspring will survive. c. is more common in species in which the female produces two or more times during a breeding season. d. is more common among male animals than among females. e. is more common among male fishes than among females.
One experiment in phototropism involved cutting off the tips of grass seedlings before exposing them to light from one side. The decapitated seedlings did not bend toward the light. A valid conclusion from this experiment would be that
A) plants cannot engage in photosynthesis without the tip of the plant. B) light is perceived by the tip of grass plants. C) a foil cover over the tip of the seedlings would cause them to bend. D) hormones are produced in all parts of the plant.
An organism that produces catalase enzyme is protected from the harmful effects of
A) singlet oxygen (1O2). B) hydroxyl radical (HO.). C) peroxide anion (O22-). D) superoxide radical (O2-). E) molecular oxygen (O2).