Which of the following is not true of the ? helix?
A. The ? helix forms a right-handed spiral.
B. Amino acid R groups point toward the helical axis.
C. The hydrogen bonds of an ? helix all point in the same direction.
D. A typical protein contains about one-third ? helix.
E. All of the answers given are correct.
B
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Homologous recombination has been observed in
A) Archaea. B) Bacteria. C) Eukarya. D) Archaea, Bacteria, and Eukarya.
After pollination delivers sperm to an ovule and the egg is fertilized, the ovule develops into a ____ and the
integument becomes the ____.
a. seed; micropyle b. seed; seed coat c. micropyle; seed d. micropyle; seed coat e. seed coat; seed
In describing the parts of the respiratory system, the word "septum" designates a partition in the
a. larynx. b. nasal cavities. c. pharynx. d. glottis. e. lungs.
Which activity is an example of biotechnology?
A. Bacteria in the soil secrete an antibiotic to kill competitors. B. Public health officials monitor diseases in a community. C. Humans use yeast to make beer and wine. D. A microbiologist uses a microscope to study bacteria. E. Mycobacterium tuberculosis causes tuberculosis in the lungs.