SCF Biology The Core

A virus consists of:

• RNA or DNA and a cell membrane

• RNA or DNA and a protein coat

• RNA and DNA and a protein coat

• proteins, cell membrane, and RNA

What happens after the virus has been taken up by the cell?

• it begins making protein

• it divides, or replicates

• it inserts into the host DNA

• it switches to infectious mode

What is the outside protective coating of a virus made of?

• lipids

• carbohydrates

• protein

• carbon

What reason do scientists give for saying that viruses are not living organisms?

• they cannot reproduce without the aid of a host

• they do not metabolize food into energy

• they do not have organized cells

• all of the above

• none of the above

Why do viruses need a host cell?

• because they aren't living

• because they need to reproduce

• because they can't live without a host cell

What is the outside, protein coat on a virus called?

• genetic material

• capsid

• envelope

• tail fibers

Which of the following statement is TRUE regarding Gram positive bacteria?

• Cell wall have high lipid content

• Lipopolysacharides layer is present

• crystal violet stain is retained

• Have 2 layers of cytoplasmic membrane.

A Gram negative cell wall is __________ than a Gram positive one.

________________ is ability to produce disease in host organism.

What is the shape and arrangement for the bacteria called Streptococcus pneumonia?

• string of spiral shaped bacteria

• string of circular shaped bacteria

• spiral and circular bacteria cluster

• pair of rod-shaped bacteria