Body appendages as diverse as crab legs, beetle legs, sea star arms, butterfly wings, fish fins, and mouse feet start out
as ____.
a. clusters of cells in the limb buds
b. cerebral cells
c. cardiac cells
d. offshoots of the sperm cell
e. offshoots of the egg
ANSWER: a
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The first patent on a living organism was granted in
A) 1790, when the U.S. passed patent law. B) 1873, for Louis Pasteur's use of yeast. C) 1900, when Mendel's laws were rediscovered. D) 1978, when modern biotechnology began with recombinant insulin.
During the mitotic spindle checkpoint,
a. cells are in anaphase. b. cells arrest if chromosomes are attached properly to the mitotic spindle. c. cells become irreversibly committed to S phase. d. cells are checked for proper spindle attachment to chromosomes. e. cells enter G0.
The correlation coefficient is a measure of the strength of association between two traits. Correlation, however, does not indicate causation
Think of one or two variables (not necessarily phenotypes) that are correlated and are causally linked, and one or two variables that may be correlated but are not likely to be causally linked.
Which of the following would be a major component of cell membrane of a fungus?
A. Cellulose B. Chitin C. Cholesterol D. Phopholipids E. Unsaturated fatty acids