Most genetic disorders of humans are caused by
A) multiple alleles.
B) recessive alleles.
C) a mutation that occurs in the egg, sperm, or zygote.
D) dominant alleles.
Answer: B
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The loss of O2 in the atmosphere 600-800 million years ago was likely due to the "fossilization" of organic matter
trapped in Earth's crust.
a. True b. False
A patient, complaining about persistent drowsiness and difficulty conceiving children undergoes a series of tests, during which it is shown that he has a significantly diminished sperm count. Excess production of which hormone could account for these symptoms?
a. luteinizing hormone b. testosterone c. melatonin d. cortisol
Viruses that attack bacteria are called:a
phages. b. bacteriods c. prions. d. virons. e. viroids
Which of the following organisms would be most likely to fossilize?
A) a rare worm B) a common worm C) a rare squirrel D) a common squirrel