Which of the following is found in both Gram (+) and Gram (-) cell walls?
A. an outer membrane
B. Peptidoglycan
C. Lipopolysaccharide
Answer: B. Peptidoglycan
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In the experiment above, guppy color patterns (spots) were measured in populations exposed to increasing amounts of predation. From this you could conclude that ____ .
A. evolutionary changes take millions of years to appear
B. predators are less likely to catch and eat brightly colored guppies
C. predators are more likely to catch and eat brightly colored guppies
D. brightly colored guppies are more likely to reproduce in the presence of predators
E. predators do not affect the color patterns of guppies
During transformation, cells ____
a. take up pieces of DNA that are released as other cells disintegrate b. take up pieces of DNA through a viral infection c. replicate DNA molecules d. make replicate copies of one another e. generate their own DNA
The cells wall of bacteria Z contains high concentrations of phospholipids along with proteins and relatively low amounts of lipopolysaccharide. When bacteria Z is gram stained, it will most like be colored?
A. Pink B. Purple C. Blue D. Clear, it does not retain any stain
One mechanism by which viruses may cause cancer is to interrupt the genetic regulatory sequences of repressor proteins. Which of the following types of viruses is most likely to be involved in causing cancer by this mechanism?
A. +ssRNA viruses B. dsRNA viruses C. -ssRNA viruses D. retroviruses E. both +ssRNA and -ssRNA viruses