In the formula, dN/dt = rN(K-N)/K, the rate of population growth approaches zero as
A. carrying capacity approaches zero.
B. the age-specific fertility rate approaches zero.
C. the per capita growth rate declines.
D. the population size approaches the carrying capacity.
D. the population size approaches the carrying capacity.
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Amino acids are assembled within the cells to form:
a. nucleic acids. b. triglycerides. c. phospholipids. d. polypeptides. e. DNA.
Which of the following occurs during recombination?
a. Homologous chromosomes exchange linear segments of genetic material. b. One gene interferes with the expression of another gene. c. Identical alleles are expressed simultaneously in a heterozygote. d. The gene order of homologous chromosomes is significantly altered.
Which of the following results from the combination of antibodies and antigens?
a. activation of the pathogen b. formation of cytotoxic T cells c. stimulation of phagocytosis d. activation of toxins e. inactivation of the complement system
Multiple flagella on one end of the cell is known as...
a. amphitrichous b. lophotrichous c. boutatrichous d. peritrichous