This is a structure at the head of a sperm cell that allows it to penetrate an egg cell
a. acrosome
b. labia
c. centriole
d. cortical granule
e. somite
A
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What is the part of a sarcomere that contains only thin filaments?
A) Z line
B) H band
C) I band
D) A band
The levels of cerain ions in the blood are regulated by the kidneys and help determine?
a. Emptying of the bladder b. Blood sugar levels c. Body temperature d. blood pressure
A DNA mutation that gives a distinguishable phenotype for a chromosome or gene is a
A) recessive allele. B) lethal mutation. C) parental type. D) linkage group. E) genetic marker.
What is suggested by the hypothesis of punctuated equilibrium?
A) There's been no change in life on Earth. B) There's been gradual and steady change in life on Earth. C) There have been short periods of dramatic evolutionary change separated by long periods of no change. D) Life on Earth changes dramatically most of the time, but there are short periods when there's no change.