Which of the following is not a modification of epithelial cells?
a. scales
b. mucus-secreting cells
c. sensory cells
d. an endoskeleton
e. poison-secreting cells
D
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A mutualistic interaction between two species is one in which:
a) both species suffer negative consequences. b) one species is harmed, but the other benefits. c) both species benefit. d) one species is harmed, but the effect on the other is neutral
Thiomargarita species utilize large amounts of ________ .
A. nitrate B. carbon dioxide C. oxygen D. sulfur
Both a man and a woman are heterozygous for freckles. Freckles ( F) are dominant over no freckles ( f). What is the chance that their child will have freckles?
a) 100% b) 25% c) 50% d) 0% e) 75%
What is NOT true regarding the use of yeast artificial chromosomes (YACs) for cloning?
a. They are circular vectors. b. Large fragments of DNA can be inserted into them. c. They have features to allow them to replicate and segregate like normal eukaryotic chromosomes. d. They contain a gene for selection.