The cytoplasm and most organelles in a zygote derive primarily from
a. the oocyte.
b. the sperm.
c. a combination of the sperm and egg.
d. the zygote, which produces its own new organelles
A
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Based on the phylogenetic tree below, which of the following statements is FALSE?
A) Species E is more closely related to species A than to species D. B) Species D is more closely related to species C than to species E. C) Species F is more closely related to species D than to species E. D) Species C is more closely related to species B than to species D.
The movement of potassium out of a resting neuron is a consequence of:
A. the electrical gradient across the membrane. B. the high concentration of potassium inside the cell. C. the presence of potassium leak channels in the membrane. D. the high concentration of potassium inside the cell AND the presence of potassium leak channels in the membrane.
Viral infections are not considered a risk factor for autosomal trisomy because a virus cannot affect human chromosome arrangement
a. True b. False Indicate whether the statement is true or false
Characteristics of freshwater runoff include: a. high salinity compared to sea water
b. high nitrogen compared to sea water. c. high detritus compared to sea water. d. high phosphorus compared to sea water.