The cytoplasmic membrane of bacteria is strengthened by
a. isoprene.
b. hopanoids.
c. lipoteichoic acids.
d. integral proteins.
Answer: B
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The genus Arthrobacter has a distinctive growth cycle in which branched rod-shaped bacteria are produced in the exponential phase, and cocci are found in stationary phase cultures.
Answer the following statement true (T) or false (F)
Which purine base forms 3 hydrogen bonds when binding its complementary nucleotide base?
A. guanine. B. cytosine. C. thymine. D. uracil. E. adenine.
Thyroid hormone is to amphibian metamorphosis as this compound is to insect molting.
A. estogen B. aldosterone C. ecdysone D. cortisol E. butterfly peptide
Transcription and translation can be coupled in bacteria but not eukaryotes because
A) no nuclear membrane exists in prokaryotes. B) no nuclear membrane exists in eukaryotes. C) the bacterial DNA is in a single chromosome. D) eukaryotic chromosomes are found in nucleoids.