Which part of the chlorophyll molecule is responsible for absorbing light?
a. methyl group
b. porphyrin ring
c. magnesium ion
d. phosphate group
e. long hydrocarbon side chain
b
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Where are most glucose transporter proteins ("GLUTs") located when levels of the hormone insulin are LOW?
A. inserted into the plasma membrane B. in the membranes of intracellular vesicles C. inserted into the nuclear membrane D. in the endoplasmic reticulum E. in the liver—They are transported to other cells when glucose levels rise.
The Arctic tern makes an annual migration of up to _______
a. 700,000 km b. 70,000 km c. 7,000 km d. 700 km e. 70 lm
A small group of mice are released on an island without mice but with abundant food for mice and no predators. Initially, the growth of the mouse population will be limited mainly by what?
A. Only density-dependent factors B. Only density-independent factors C. The biotic potential D. The carrying capacity
What is the selective advantage of a mature red blood cell being flat rather than a sphere?
A. It maximizes the relative surface area available to exchange gases. B. It provides more sites for the membrane-bound hemoglobin molecules which transport oxygen. C. It saves energy by making more membrane relative to the volume of the cell. D. It provides more membrane for the electron transport chains where oxygen is consumed. E. The cell's surface area to volume will decrease, making it easier for the cell to fit through arteries and veins.