What causes rigor mortis?

A) exhaustion of Ca2+ from the sarcoplasmic reticulum
B) lack of ATP in dead tissue
C) lack of acetylcholine (ACh) in dead tissue
D) cessation of action potentials after death


Answer: B

Biology & Microbiology

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Which of the following is not an advantage of extracellular digestion?

A. The interior of cells is protected from hydrolytic enzymes. B. Very large portions of food can be consumed at once and digested over a long period of hours to weeks. C. Specialized regions of the cavity can segregate digested food from nondigested food. D. Digestion can be regulated by hormones. E. Vacuoles allow for direct phagocytosis by individual cells.

Biology & Microbiology

Which of the following do researchers suspect is an important factor in colony collapse disorder (CCD?)

a. Habitat fragmentation caused by land development inhibits a bee’s chance of finding a reproductive partner. b. Long-term exposure to low levels of insecticides impair a plant’s ability to produce nectar that a bee can use. c. Exposure to extremely high levels of herbicides can kill an entire population of plants and the bees that depend on them. d. Herbicides kill the plants that bees pollinate thereby eliminating the source of nectar for a bee. e. Long-term exposure to low levels of insecticides impair a bee’s ability to navigate and communicate.

Biology & Microbiology

________ refers to the fraction of the total variation in a trait that is due to variation in genes

Fill in the blank(s) with correct word

Biology & Microbiology

Which of the following choices lists the organs of the human alimentary canal in the CORRECT order?

A) pharynx, oral cavity, esophagus, stomach, large intestine B) oral cavity, pharynx, esophagus, stomach, small intestine, large intestine C) esophagus, pharynx, stomach, large intestine, small intestine D) oral cavity, esophagus, stomach, large intestine, small intestine

Biology & Microbiology