Where in the eudicot plant root would you expect to find vascular tissue?
A. parallel to the edge
B. between the ground and dermal tissue
C. in the center
D. scattered in the root
E. near the edge
Answer: C
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The ________________ can differentiate into stems, leaves, or flowers.
A. suspensor B. shoot meristem C. basal region D. central region E. root meristem
Genetic studies of an animal show that eye color is controlled by an autosomal gene with the dominant allele (R) for red
eye color and the recessive allele (r) for yellow eye color. A second autosomal gene has the dominant allele (T) for paws with thumbs and the recessive allele (t) for paws without thumbs. The genetic cross RRTT x rrtt creates offspring with genotype RrTt. One of those dihybrids is mated in a testcross (RrTt x rrtt). Based on the principle of independent assortment, the testcross should produce offspring with the phenotype ratio ____.
a. 3 red-eyed with thumbs : 1 yellow-eyed without thumbs b. 1 red-eyed with thumbs : 1 yellow-eyed with thumbs: 1 red-eyed without thumbs: 1 yellow-eyed without thumbs c. 1 red-eyed with thumbs : 1 yellow-eyed without thumbs d. 9 red-eyed with thumbs : 3 yellow-eyed with thumbs: 3 red-eyed without thumbs: 1 yellow-eyed without thumbs e. 3 yellow-eyed with thumbs : 1 red-eyed without thumbs
Which of the following organisms is a keystone species in a tropical rain forest?
a. gray wolf b. fruit-eating bats c. poison arrow frogs d. fig trees e. fruit-eating monkeys
Mammalian eyes sense light because the photoreceptor cells have molecules called opsins, which change structure when exposed to light. Which of the following plant molecules would be analogous to mammalian opsins in their light-sensing ability?
A) auxin and phytochrome B) auxin and Pfr C) Pfr and phytochrome D) cytokinins and phototropins