The coefficient of relatedness of a human child to its full sibling is, on average,
A. 0.25.
B. 1.5.
C. 1.
D. 0.5.
E. 0.75.
Answer: D
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Hemoglobin transports oxygen in the blood and consists of a chain of 146 amino acids. How many different types of amino acids are used to construct proteins?
A. 2 B. 20 C. 146 D. 200
In what way is cytokinesis in plant cells similar to binary fission in a bacterium?
A. Cell wall material is deposited between the two nuclei to separate the daughter cells. B. A ring of actin filaments constricts the plasma membrane between the two nuclei to separate the daughter cells. C. A microtubulin-like structure constricts the plasma membrane between the two nuclei to separate the daughter cells. D. A motor protein slides microtubules in a contractile ring at the plasma membrane between the two nuclei to separate the daughter cells. E. All of these choices are correct.
The enzyme lysozyme offers protection from
a. viruses. b. bacteria. c. fungi. d. protists. e. viruses and bacteria.
Flowering plants are capable of fertilization in the absence of water because the
A. processes of pollination and fertilization occur in the soil B. pollen tubes deliver the sperm to the eggs C. eggs develop without sperm by parthenogenesis D. Eggs have a structure that aids in their dispersal by wind E. sperm contain large amounts of cytoplasm