Proximity of capillaries to tissue cells is crucial
because
a. bulk flow operates to move protein-free plasma
through clefts between endothelial cells.
b. red cells have to squeeze single file through
capillaries.
c. some proteins exit capillaries by endocytosis and
exocytosis.
d. diffusion is a slow process.
e. all of these are true.
Answer: d
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What is a possible explanation for why a population may not be in Hardy-Weinberg equilibrium?
A. There are more than two alleles for a trait. B. One allele for a trait is fixed in the population. C. Evolution is occurring on a trait in the population. D. Hardy-Weinberg does not work for all traits. E. The alleles for a trait being examined exhibit incomplete dominance.
The autonomic nervous system regulates
A. blood pressure. B. heart contractions. C. digestive system function. D. skeletal muscle contractions. E. All of these answers are correct except "skeletal muscle contractions."
Endomycorrhizal fungi penetrate the plasma membranes of root cells
____________________ Indicate whether the statement is true or false.
Toxicants that cause harm by triggering over activation of the immune system are called ___.
a. neurotoxins b. teratogens c. allergens d. antibiotics