A human female with only one X chromosome is said to have a condition called
A. Turner syndrome.
B. Klinefelter syndrome.
C. Down syndrome.
D. Angelman syndrome.
E. X chromosome inactivation.
Answer: A
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What special adaptation(s) has/have Thermoplasma evolved to survive in hot acidic environments?
A) Thermoplasma stabilize their cytoplasmic membrane by incorporation of tetraether lipoglycans in the cytoplasmic membrane. B) Thermoplasma have a reinforced cell wall containing basic amino linkers in the peptidoglycan. C) Thermoplasma excrete hydrogen ions and import hydroxyl ions. D) Thermoplasma are highly motile to avoid destruction.
Exposure to a light source ____
a. increases melatonin levels b. increase testosterone levels c. decrease testosterone levels d. is used to treat SAD and jet lag e. is used to treat some cancers
The edible portion of the mushroom is the ________
A) mycelium B) hypha C) spore D) above-ground reproductive structure
The yolk sac of humans
A) stores nutrients to support the developing embryo. B) is evidence of humans' relationships with egg-laying vertebrates. C) secretes HCG. D) absorbs nutrients from, and releases waste to, the mother's blood.