An animal's reward for pollinating a flower may include all of the following except ________
a. seeds
b. high-energy oils
c. the illusion of sexual intercourse
d. nectar and pollen
a
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How does the release of histamine by mast cells help the innate immune response?
A. It signals neutrophils to migrate to the site of infection. B. It makes it easier for neutrophils to move from the bloodstream to the site of infection. C. It increases the volume of blood flow in the area of the infection. D. Two answer options are correct: It makes it easier for neutrophils to move from the bloodstream to the site of infection AND increases the volume of blood flow in the area of the infection.
Diffusion is an example of ________
A) phagocytosis B) active transport C) endocytosis D) passive transport
A researcher is using adult stem cells and comparing them to other adult cells from the same tissue. Which of the following is a likely finding?
A) The cells from the two sources exhibit different patterns of DNA methylation. B) Adult stem cells have more DNA nucleotides than their counterparts. C) The two kinds of cells have virtually identical gene expression patterns in microarrays. D) The nonstem cells have fewer repressed genes.
What is the free-running nature of circadian rhythm analogous to?
a. a desktop computer b. a digital telephone c. an old-fashioned wrist watch d. a modern calculator