During a laboratory experiment, you discover that an enzyme-catalyzed reaction has a ?G of -20 kcal/mol. If you double the amount of enzyme in the reaction, what will be the ?G for the new reaction?
A) -40 kcal/mol
B) -20 kcal/mol
C) 0 kcal/mol
D) +20 kcal/mol
B
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Maternal effect genes
A. are all found on the X chromosome. B. are expressed only in female offspring. C. can encode proteins that get translated upon fertilization to establish concentration gradients that span the egg. D. are expressed only in male offspring because they are hemizygous. E. are expressed when exposed to high concentrations of estrogen.
Nondisjunction may cause
A. trisomy 21. B. Turner syndrome. C. Jacobs syndrome. D. All answers are correct. E. Klinefelter syndrome.
Extinction occurs when all individuals of a population die out
Indicate whether the statement is true or false
What is the name of the third germ layer that forms during gastrulation? (Figure 29-4)
a) primitive streak b) mesoderm c) embryonic disc d) ectoderm e) endoderm