An embolus could block blood flow to the ________, resulting in a myocardial infarction, or it may block blood in the ________ and cause a stroke
A) brain; kidney
B) liver; kidney
C) heart; brain
D) brain; heart
E) heart; kidney
Answer: C
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A plasmid is a
a. small segment of DNA that is often isolated from virus chromosomes for cloning purposes. b. large linear segment of DNA that is often isolated from bacterial chromosomes for cloning purposes. c. small circular segment of DNA in bacteria that is linked by hydrogen bonds to the main bacterial chromosome. d. large circular segment of DNA in bacteria that is completely separated with the chromosome. e. small circular segment of DNA in bacteria that is completely separated from the chromosome.
In cases where selection consistently favors a higher (or lower) value of a trait or phenotype, the result over time is a change in the average value of a trait in the population. This mode of selection is known as ________
A) directional selection B) stabilizing selection C) disruptive selection D) selection gradient
Refer to Figure 10-1. Which of the following combinations of letters accurately represents two sister chromatids?
a. A and B
b. A and C
c. A and D
d. A and E
e. B and F
What is the protein coat of a virus called?
a. envelope b. capsule c. capsid d. phage e. pilus