A mutation is ___________.
A. a temporary and reversible alteration in a DNA molecule
B. a mistake that can occur in either transcription or translation
C. a change in the nucleotide sequence of DNA
D. blockage of the ribosome-binding sites
C. a change in the nucleotide sequence of DNA
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The first defense cells that interact with a pathogen in the body are
A) T cells. B) macrophages. C) B cells. D) mast cells.
Over the past several decades, populations of Staphylococcus aureus (a type of bacteria that infects wounds) have become resistant to penicillin. You run the following experiment:
As mentioned above, resistance to penicillin is a different biological mechanism than resistance to antibiotic X. What is the probable origin of antibiotic X resistance in these cells? A. The cells probably developed resistance to antibiotic X by undergoing mutation when exposed to the drug, and thus survived the exposure. B. A small percentage of the cells had preexisting mutations that confer resistance to antibiotic X. These cells survived exposure to the drug. C. Either of the other two options could be correct because both happen often in nature. More information is needed to answer the question.
Select the best response to the question
?Nasal specimens are indicated when testing for all of the following conditions except: A) sinus infections. B) rhinoviruses. C) influenza. D) respiratory syncytial virus.
What group of fungi is largely responsible for the reduction in amphibian populations worldwide?
A. Microsporidia B. Ascomycetes C. Basidiomycetes D. Chytridomycetes E. Glomerulomycetes