Which of the following gives rise to lateral roots?
a. endodermis
b. cortex
c. epidermis
d. pericycle
e. pith
Answer: d
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A trait with variable expressivity is one that:
A. is only expressed in homozygous recessive individuals. B. is only expressed in homozygous dominant individuals. C. is only expressed in some of the individuals that have the genotype for that trait. D. is expressed in only some offspring of affected individuals. E. can be expressed differently in different individuals that have the genotype for that trait.
A noncompetitive inhibitor will affect the ________ of an enzymatic reaction.
A) Km B) Vmax C) S D) P E) both choices A and B
Why is nitrogen fixation by prokaryotes essential to life on Earth?
a. It removes nitrogen from the soil. b. It converts atmospheric nitrogen to a non-toxic form. c. It provides nitrogen sources for plants and animals. d. It provides an energy source for photosynthesis. e. It allows for the breakdown of complex macromolecules.
Steroid hormones are derived from
a. free fatty acids. b. cortisol. c. tyrosine. d. cholesterol. e. alanine.