The human species first appeared in the

A) Cretaceous period.
B) Permian period.
C) Tertiary period.
D) Quaternary period.
E) Jurassic period.


D

Biology & Microbiology

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According to the Endangered Species Act, what is required when a species is identified as at-risk?

a. A management plan to protect the species must be created. b. Land must be purchased by the government to protect the species. c. A biodiversity hotspot must be established to protect the species. d. The habitat of the species must be maintained or restored.

Biology & Microbiology

The enzyme that helps pack DNA into the cell by coiling the DNA into a tight bundle is ________.

A. DNA ligase B. DNA polymerase C. DNA helicase D. DNA gyrase E. primase

Biology & Microbiology

Mutations in DNA are usually repaired in healthy cells by DNA repair enzymes

Indicate whether the statement is true or false

Biology & Microbiology

If you forgot to heat fix a smear before doing a Gram stain, which of the following might occur?

A. The smear may not adhere to the slide. B. The stains would not adhere to the bacteria. C. The decolorization step of the Gram stain would not work properly. D. Gram-positive and Gram-negative bacteria would both stain purple.

Biology & Microbiology