A bacterial flagellum allows movement by undulating or waving back and forth.
a. true
b. false
Ans: b. false
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Mendel performed reciprocal crosses in which he used pollen from a white-flowered plant to fertilize a purple-flowered plant and pollen from a purple-flowered plant to fertilize a white-flowered plant. What did these reciprocal crosses demonstrate?
A. The female gamete made a larger genetic contribution to the offspring than the male gamete. B. Each parent made an equal genetic contribution to the offspring. C. Flower color is a sex-linked trait. D. The traits of flower color and sex assort independently. E. The male gamete made a larger genetic contribution to the offspring than the female gamete.
Which of the following acids is not used to destroy or inhibit microbial cells in food?
A. Benzoic acid B. Lactic acid C. Propionic acid D. Phosphoric acid E. Acetic acid
Sometimes an allele that has no phenotypic effect can spread through a population by means of
a. a selective sweep b. genetic recombination c. disruptive selection d. frequency-dependent selection e. directional selection
A pair of cells that surrounds each stoma and controls its opening and closing are the
A. companion cells. B. guard cells. C. sieve tube cells. D. pith cells. E. vascular cells.