Organisms that grow at 0°C and have a maximum growth temperature of 35°C are called ________.

A. frigiphiles
B. mesophiles
C. psychrophiles
D. psychrotrophs


Answer: D

Biology & Microbiology

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Spongiform encephalopathy describes all of the following diseases except:

A) Alzheimer's disease B) Mad Cow disease C) Kuru D) Elk wasting disease E) Creutzfeld - Jakob disease

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A recessive allele is one

A) that produces no effect when present in the homozygous condition. B) that is not expressed as strongly as a dominant allele. C) that must be lethal in the homozygous condition. D) whose effect is masked when paired with a dominant allele. E) that appears only in a heterozygote.

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What would a scientist need to use in the CRISPR-Cas system to introduce a small deletion into a gene?

A. CRISPR gene B. sgRNA C. Cas2 gene D. donor DNA E. Cas9 gene

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