Which of the following statements about bacteria is false?
a. A small percentage of bacteria are pathogenic.
b. Some bacteria can photosynthesize.
c. Bacteria are important decomposers.
d. Bacteria are not cellular and are sometimes not classified as life forms.
e. Bacteria convert atmospheric nitrogen into ammonia and then nitrates that can be used by
plants.
D
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Which factor plays a role in determining blood pressure? a. Arteriole dilation b. Total blood volume c. All of these choices
d. Amount of blood the ventricle pumps out e. Cardiac output
What structures are used for direct cell to cell signaling?
Desmosomes Tight junctions Exocytosis vesicles Gap junctions
Steroids
a. have no fatty-acid component. b. consist of four rings. c. may have different numbers, types, and positions of functional groups attached to them. d. are a specialized type of lipid. e. are all of these.
A membrane is more “fluid” than solid because
a. phospholipid tails prevent close packing. b. proteins can shift positions. c. water is the main component. d. phospholipid tails prevent close packing, and proteins can shift positions. e. phospholipid tails prevent close packing, proteins can shift positions, and water is the main component.