Answer the following questions true (T) or false (F)
1. The endospore stain reveals internal structures within cells of the genera Bacillus and Clostridium.
2. Acid-fast cells such as Mycobacterium lose the color of the primary stain in the presence of hydrochloric acid.
3. Three-dimensional images of specimens can be obtained using scanning electron microscopes.
1. TRUE
2. FALSE
3. TRUE
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A polycistronic mRNA with six protein coding genes would have:
A. 1 start codon and 1 stop codon. B. 1 start codon and 6 stop codons. C. 6 start codons and 1 stop codon. D. 6 start codons and 6 stop codons. E. 3 start codons and 3 stop codons.
The principle of parsimony ____ for constructing the phylogenetic tree that represents the smallest number of
evolutionary changes.
a. minimizes the number of homologiesb. maximizes the number of homologies c. completely ignores homologies d. minimizes the number of homoplasies e. maximizes the number of homoplasies
Which sentence best describes the process of noncompetitive feedback inhibition?
a. The inhibitor binds to the active site and directly blocks the active site of the enzyme. b. The products of the reaction at the end of the pathway bind to a site other than the active site of an enzyme at or near the beginning of the pathway, and block enzyme activity indirectly. c. The products of the reaction at the end of the pathway block the active site of the enzyme, inhibiting it directly. d. The substrate and cofactors co
Atherosclerosis
A) is caused by a diet high in salt. B) causes a loss of plaque from the walls of the arteries. C) reduces blood flow in arteries. D) is a condition of the veins. E) is another name for high blood pressure.