An enzyme produced in response to the presence of a substrate is called a(n)
A) inducible enzyme.
B) repressible enzyme.
C) restriction enzyme.
D) operator.
E) promoter.
A
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Which condition would most likely lead to an apparently normal human female?
a. Turner syndrome b. Down syndrome c. cri-du-chat d. Triple-X syndrome e. Klinefelter syndrome
If a 1n egg is fertilized by a n-l sperm, the
resulting zygote will have
a. the chromosome number 2n?1. b. a chromosome without its homologue. c. a condition called monosomy. d. a genetic disorder. e. all of these conditions
Prokaryotic cells are represented by fossils that are dated back as far as _____ billion years ago.
A. 1.5 B. 2.8 C. 3.8 D. 4.8
Which of the following may have cell walls containing teichoic acids?
A. Gram-negative bacteria only B. Gram-positive bacteria only C. archaea D. both Gram-positive and Gram-negative bacteria E. all prokaryotes