______ are often mistaken for palm trees because of their leaf shape but bear large cones and are under threat of extinction.

a. Conifers
b. Ginkophytes
c. Cycads
d. Gnetophytes


c. Cycads

Cycads are often mistaken for palm trees because of their leaf shape but bear large cones and are under threat of extinction.

Biology & Microbiology

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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). If the two genes are completely linked (no recombination occurs between them), then 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. 1 yellow-eyed with thumbs : 1 red-eyed without thumbs.

Biology & Microbiology

If peach trees growing in specific mild climates of the southern United States do not receive about 850 hours of

temperatures below 40 degrees, they will not produce flowers in the spring. This is explained by which of the following terms?

a. photoperiodism b. phototropism c. senescence d. vernalization e. dormancy

Biology & Microbiology

Arrange the stages of sperm development in chronological order

1) sperm 2) spermatid 3) primary spermatocyte 4) secondary spermatocyte 5) spermatogonium a. 5 ? 2 ? 3 ? 4 ? 1 b. 5 ? 3 ? 4 ? 2 ? 1 c. 2 ? 3 ? 4 ? 1 ? 5 d. 2 ? 5 ? 3 ? 4 ? 1 e. 3 ? 4 ? 5 ? 2 ? 1

Biology & Microbiology

The case of the anorexic student illustrated the role of ________ in the etiology of anoerxia.

(a) stimulus anticipation (b) punishment (c) conditioned-taste aversions (d) the high positive incentive value of food

Biology & Microbiology