An epidemic is
A. a disease that maintains a steady low-level frequency.
B. a sudden increase in the occurrence of a disease above the expected level.
C. a sudden unexpected occurrence of a disease in a limited segment of a population.
D. when a disease occurs occasionally and at erratic intervals in the human population.
Answer: B
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The genes microcephalin and ASPM have been implicated in what aspect of human evolution?
A. the evolution of our large frontal cortex B. the evolution of language C. the evolution of bipedal locomotion (walking upright) D. the evolution of an opposable thumb E. the evolution of mother-infant bonding
Which of the following is NOT one of Mendel's hypotheses to explain the results of his P, F1 and F2
crosses?
a. Adult plants carry a pair of genes that will determine the inheritance of each allele. b. If an adult plant has two different alleles, one is dominant over the other. c. Adult plants always have traits that are governed by a single pair of alleles, but the number of possible alleles varies with each trait. d. The pairs of alleles separate in the formation of gametes so that each gamete gets one allele of the pair. e. If an adult plant has two different alleles, one is recessive to the other.
Of the following, which kingdom contains the most diversity in terms of DNA sequences?
a. Plantae b. Protista c. Fungi d. Animalia e. All of these are approximately equivalently diverse.
By a __________, transpiration pulls water upward by creating a continuous negative pressure (or
tension) inside xylem from leaves to roots. Fill in the blank(s) with the appropriate word(s).