Which of the following statements about DNA is FALSE?
A. One chromosome is made up of many DNA molecules.
B. A eukaryotic genome is made up of many DNA molecules.
C. A DNA double helix contains both covalent bonds and hydrogen bonds.
D. A strand of DNA is made up of many nucleotides.
E. All of these are TRUE.
A. One chromosome is made up of many DNA molecules.
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A strain that can grow in a minimal medium containing arginine, but NOT in minimal media containing citrulline nor in minimal media containing ornithine would have a mutation in the gene that encodes for _____.
Wild type bread mold can grow in a minimal medium without supplements, while certain mutated strains can only grow in a minimal medium that is supplemented with specific intermediates. See the figure below for an overview of the arginine biosynthetic pathway.
A. enzyme 1.
B. enzyme 2.
C. enzyme 3.
D. both enzymes 1 and 3.
E. both enzymes 2 and 3.
Earthworms and slugs move by
A) contracting their cilia. B) contracting extensor and flexor muscles attached to their endoskeleton. C) alternating contractions of longitudinal and circular muscles. D) stretching their longitudinal muscles and contracting their circular muscles.
Selective (action/toxicity/treatment) means that a given antimicrobial agent is more toxic to a pathogen than to the host being treated.
Fill in the blank(s) with the appropriate word(s).
The toxin of Staphylococcus aureus strains that causes blisters and desquamation of skin in scalded skin syndrome is
A) Toxic shock syndrome toxin B) Hemolysin C) Enterotoxin D) Exfoliative toxin E) Erythrogenic toxin