The term that refers to the presence of a tuft of flagella emerging from the same site is
A. amphitrichous.
B. atrichous.
C. lophotrichous.
D. monotrichous.
E. peritrichous.
Ans: C. lophotrichous.
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Granulicatella spp. and Abiotrophia spp. are dependent on which nutritional additive for optimal growth?
a. Vitamin K b. Vitamin B6 c. Vitamin B12 d. Vitamin D
In many animals, this polysaccharide is found in large quantities in liver and muscle cells. It is highly
branched, with many ?(1-4) and ?(1-6) linkages.
a. chitin b. amylopectin c. cellulose d. glycogen e. amylose
In some flowers, a purple pigment is synthesized from a red precursor pigment. In the absence of all pigment, flowers are white. A pure-breeding plant with red flowers was crossed to a pure-breeding plant with white flowers. All of the F1 plants had white flowers. The F1 plants were crossed to each other, and the F2 consisted of 165 plants: 123 with white flowers, 32 with purple flowers, and 11 with red flowers. How do these results suggest that flower color is determined?
A) One gene with two alleles exists and heterozygotes have a different phenotype than either homozygote. B) The dominant allele of one gene masks the effect of a second gene. C) The recessive allele of one gene masks the effect of a second gene. D) A dominant allele of two genes is necessary for purple flowers. E) A dominant allele of either of two genes is sufficient for purple flowers.
Stepwise condensation of linear DNA happens in five different packing processes. Which of the following four processes has a direct requirement for histone H1?
(a) formation of "beads-on-a-string" (b) formation of the 30-nm fiber (c) looping of the 30-nm fiber (d) packing of loops to form interphase chromosomes