Which cells may spend the most time in interphase?
a. epithelial cells lining the stomach
b. hair follicles
c. motor neurons in the spine
d. skin cells on the hands
Answer: c. motor neurons in the spine
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How does the immune system of vertebrates utilize a chemical concentration gradient?
A) The immune system produces thousands of histamines that act solely to create a histamine diffusion barrier. B) The immune system generates a gradient of reactive oxygen intermediates to increase the amount of toxic radicals and peroxides to combat invading pathogens. C) The immune system releases chemical signals called chemokines, which create a chemical gradient that leukocytes use in migrating toward the infection site. D) The vertebrate immune system does not use chemical gradients.
Which of the following functions is NOT performed by integral membrane proteins?
a. cell adhesion b. transport c. signal reception d. cell recognition e. cell reproduction
A mountain rain shadow "falls" on the:
a. arid area on the windward slope b. wet area on the windward slope c. arid area on the leeward slope d. wet area on the leeward slope e. arid area on both slope
Answer the following questions true (T) or false (F)
1. Hot weather is common to all deserts. 2. Tropical rainforests are known for having high biodiversity but relatively poor soil. 3. Overall, the abundance of life is higher in the coastal zones of marine ecosystems than the open ocean.