If the hypothesis stating viruses evolved prior to living organisms on Earth is true, the first type of viruses in the world were likely

A) bacteriophage.
B) DNA viruses.
C) retroviruses.
D) RNA viruses.


Answer: D

Biology & Microbiology

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This is the stage of mitosis characterized by the alignment of the chromosomes in a ring along the inner circumference of the cell:  

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Prokaryotes that harvest both energy and carbon atoms from organic molecules are called  

A.  photoautotrophs. B.  chemolithoautotrophs. C.  photoheterotrophs. D.  chemoheterotrophs. E.  nitrogen fixers.

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Describe the chemical properties of phospholipids that account for their behavior in water

What will be an ideal response?

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Which is characteristic of codons (Select all that apply)?

a. are three-base sequences of mRNA b. are complementary to anticodons c. are base triplets d. code for amino acids e. are three-base sequences of tRNA

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