What feature is common to all the alveolates?
a. autotrophy
b. lung-like sacs used for respiration
c. bioluminescence
d. complex life cycle with two hosts
e. membrane-bound sacs beneath the plasma membrane
ANSWER: e
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Which of the following is a characteristic of the set of genes in an operon that is not true of a regulon?
A. Transcription can produce long polycistronic mRNA that contains multiple genes in each transcript. B. Each gene of the set usually contains its own Shine-Dalgarno sequence. C. Regulation of gene expression can occur through activation or repression mechanisms. D. All of the genes in the set are controlled by a single promoter.
Which of the following is caused by Haemophilus influenzae in the respiratory tract?
A. Otitis media B. Epiglottitis C. Bronchitis D. Bacterial meningitis E. Influenza (flu)
Initiation of transcription requires:a
a promoter sequence. b. DNA polymerase. c. an RNA primer. d. a DNA primer. e. Okazaki fragments
Comparison of the human ecological footprint to Earth's biocapacity suggests that
A) the human population can continue at its present level of resource usage indefinitely. B) global warming is seriously damaging most ecosystems. C) the human population is growing slowly. D) the human population will soon rapidly decrease in size. E) the human population cannot sustain its current level of resource usage.