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.
A. It maximizes the relative surface area available to exchange gases.
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A horticulturist is breeding a new variety of houseplant in which two genes control leaf color. G (allele for green) is dominant to g (yellow) and B (second allele for green) is dominant to b (yellow). The recessive homozygous condition of either gene will mask a dominant allele. What color is a plant with the genotype GgBb? rev
A. green B. yellow C. an intermediate yellow-green D. variegated (yellow and green spots or stripes) E. The color cannot be determined with the information given.
In the process of nitrogen fixation, if you start with 5 molecules of N2, you will need _____ hydrogen atoms and _____ ATP molecules to make _____ molecules of ammonia.
A. 15; 16; 5 B. 15; 80; 10 C. 30; 80; 10 D. 30; 80; 5
Ovulation is triggered primarily by
a. high levels of LH. b. low levels of FSH. c. high levels of chorionic gonadotropin. d. high levels of estrogen. e. high levels of progesterone.
Which description of skeletal muscle is correct?
a. Each cell contains one nucleus. b. The fibers and filaments are arranged in parallel. c. Sarcomeres work in opposite directions during contraction. d. Actin power strokes produce the contraction. e. The thin filaments are situated in the middle of each sarcomere.