1. Which statement is FALSE regarding bacterial and archaeal
cells?

Select one:

A. Archaeal and bacterial plasma membranes consist of a thin
bilayer of lipid molecules penetrated by proteins.

B. Bacteria and archaea have group specific specializations in
their cell envelope.

C. Archaea can have a single- or double-layered membrane.

D. Bacteria can have a single- or double-layered membrane.

E. Both bacteria and archaea have a layer of peptidoglycan in
their cell envelope.

2.Which reason is MOST probable for why carbon is used in living
organisms but not silicon?

Select one:

A. Carbon can make four bonds, whereas silicon can only make
three.

B. Silicon is heavier, and therefore its bonds are stronger.

C. Carbon can form more preferred geometries when bonding.

D. Carbon is lighter, and therefore its bonds are stronger.

E. Carbon can make double bonds, but silicon cannot.

3.

Which statement is TRUE regarding energy sources used by
organisms?

Select one:

A. All phototrophs are autotrophs that can use carbon dioxide as
a carbon source.

B. Phototrophs can use carbon dioxide as an energy source.

C. Phototrophs can use carbon dioxide as a carbon source.

D. All phototrophs are autotrophs.

E. All chemotrophs are heterotrophs.