BIOL 1070 Exam 2 Review

virus

A ______ is genetic information (DNA/RNA) enclosed in a protein coat

Genetic Information (DNA or RNA)

A protein coat called a capsid

Viruses lack many of the structures found in cells; However, all have the following

enzymes; viral envelope

Additionally, some viruses may have things like _______ (e.g. reverse transcriptase in HIV)

Others may have a ______________, derived from the host cell

Bacteriophages

__________ are viruses that infect bacteria

12 times

Viruses are, on average, less than ____________ the size of bacteria

Regressive Hypothesis

The _____________ suggests that viruses may have once been smaller, parasitic cells

Cellular Origin Hypothesis

_____________ suggests that viruses may have originated from bits of DNA and RNA that left the greater genome

Coevolution Hypothesis

The ___________________ posits that viruses evolved at the same time as complex cells, and have been always dependent on cellular life