A vaccine works by
A) inhibiting bacterial replication.
B) stimulating the immune system.
C) inhibiting viral replication.
D) preventing the translation of mRNA.
Answer: B
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Muscle contraction occurs in a cyclic process. Which of the following sequences is in the correct order?
A) power stroke, cross bridge formation, cross bridge dissociation, cocking of myosin B) cross bridge formation, power stroke, cross bridge dissociation, cocking of myosin C) cross bridge formation, cocking of myosin, power stroke, cross bridge dissociation D) cross bridge formation, cross bridge dissociation, cocking of myosin, power stroke E) cross bridge formation, power stroke, cross bridge dissociation, power stroke, cocking of myosin
A number of different phylogenies (evolutionary tress) have been proposed by scientists. These phylogenies are useful because they can be used to
A. determine when two similar populations of a species evolved into two separate species B. Evaluate which groups of organisms may be most closely related C. demonstrate that all photosynthetic organisms are members of the Kingdom Plantae D. demonstrate that natural selection is the prevailing force in evolution E. demonstrate which taxa (groups of organisms) contain the most highly evolved species
How is natural selection related to sexual reproduction as opposed to asexual reproduction?
A) Sexual reproduction results in many new gene combinations, some of which will lead to differential reproduction. B) Sexual reproduction results in the greatest number of new mutations. C) Sexual reproduction allows the greatest number of offspring to be produced. D) Sexual reproduction utilizes far less energy than asexual reproduction.
Feeding antibiotics to livestock promotes human health.
Answer the following statement true (T) or false (F)