Practice Questions

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#Question id: 4943

In what way were conditions on the early Earth of more than 3 billion years ago different from those on todayʹs Earth?

#XL - S Microbiology

only early Earth had water vapor in its atmosphere.
Only early Earth was intensely bombarded by large space debris.
Only early Earth had an oxidizing atmosphere.
Less ultraviolet radiation penetrated Earthʹs early atmosphere.

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#Question id: 4984

#XL - S Microbiology

A hypothetical mutation in a squirrel population produces organisms with eight legs rather than four. Further, these mutant squirrels survive, successfully invade new habitats, and eventually give rise to a new species. The initial event, giving rise to extra legs, would be a good example of

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#Question id: 13045

#XL - S Microbiology

Maxam Gilbert DNA sequencing causes cleavage of DNA based on:

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#Question id: 4155

#XL - T Zoology

Of all the possible triplet codons, __ do not code for an amino acid.

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#Question id: 1773

#XL - Q Biochemistry

How many disulfide bonds are in an antibody?