A catalase-negative, non–spore forming, and gram-positive rod that is not acid-fast could possibly belong to which group of bacteria?
a. Corynebacterium
b. Bacillus
c. Actinomyces
d. Erysipelothrix
D
The genera described in this chapter are all catalase-negative, non–spore forming, and gram-positive rods; some may exhibit rudimentary branching.
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What will happen if the Mu repressor is not synthesized?
A) Genome replication will not be able to occur. B) It will lyse its host. C) Mu will improperly synthesize its capsid. D) Transposition will not be possible.
For which of the following can Koch's postulates be used to identify the organism causing the disease?
a. Streptococcus pyogenes, the organism that causes strep throat, which can be cultured on blood agar in the laboratory b. Treponema pallidum, the causative agent of syphilis, which cannot be grown in the laboratory c. HIV (human immunodeficiency virus), the agent causing AIDS, a disease of the human immune system d. Allergies
ALL mushrooms are basidiomycetes
Indicate whether the statement is true or false.
Rank the following one-base point mutations (from most likely to least likely) with respect to their likelihood of affecting the structure of the corresponding polypeptide. 1. insertion mutation deep within an intron 2
substitution mutation at the third position of an exonic codon 3. substitution mutation at the second position of an exonic codon 4. deletion mutation within the first exon of the gene A) 1, 2, 3, 4 B) 4, 3, 2, 1 C) 2, 1, 4, 3 D) 3, 1, 4, 2