The primate-like mammals first arose about
how many million years ago?
a. 95
b. 85
c. 55
d. 25
e. 15
B
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If a study of several pedigrees demonstrated that two parents are normal but their children express a
trait, then the trait is controlled by a a. codominant gene. b. simple dominant gene. c. recessive gene. d. sex-linked gene. e. No conclusion can be drawn.
E. coli is a rod-shaped bacterium found in the human intestine
Indicate whether the statement is true or false
The process of assembling a new or improved biochemical pathway to make products or to degrade toxic compounds is
a. protein fusion. b. operon fusion. c. pathway engineering. d. gene mining.
Answer the following statements true (T) or false (F)
1. Bacterial capsules protect bacteria from being phagocytized by leukocytes. 2. A headache is a classic example of a sign of a disease. 3. To cause disease, all bacterial pathogens must first attach to some tissue in the body. 4. Rickettsias and chlamydias are examples of obligate intracellular pathogens. 5. Babesia spp., Ehrlichia spp., and Plasmodium spp. are examples of intraerythrocytic pathogens.