When two genes are located on different chromosomes, ____ of the offspring from a testcross for
genetic linkage should have a recombinant phenotype.
a. over 75%
b. about 50%
c. about 25%
d. about 10%
e. about 5%
B
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Which of the following statements regarding enzymes is true?
a. Enzymes are permanently altered by the reactions they catalyze. b. Enzymes only work on endergonic reactions. c. Enzymes alter the chemical composition of the products of a reaction. d. Enzymes increase reaction rates. e. Enzymes prevent changes in substrate concentrations from having an effect on reaction rate.
Which of these adaptations to a terrestrial existence evolved most recently?
A) vascular tissue B) seeds C) lignin D) cuticle
Activated G protein-coupled receptors can ____________.
a. bind GTP b. open an ion channel c. raise cytosolic calcium d. a and b are correct e. a, b and c are correct
An element has 8 protons, 9 neutrons, and 8 electrons. Its atomic number and atomic mass, respectively, are _________.
Fill in the blank(s) with the appropriate word(s).