A shared ancestral characteristic used in cladistics is found
A. only in the most distant ancestor.
B. in both the outgroup and the ingroup.
C. in two of the outgroups.
D. only among the members of the ingroup.
E. only in the two most recent ancestors.
Ans: B. in both the outgroup and the ingroup.
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Amanda was successfully treated for the P. aeruginosa infection, but on a subsequent visit to
the hospital, she was infected again. With this second infection, her immune system would ____________________.
a. respond more quickly to the antigen b. immediately start to produce memory cells c. have a reduced response due to recognizing the antigen d. not be able to fight off the infection
The velocity of blood flow is the lowest in capillaries because _____
A) the capillaries have internal valves that slow the flow of blood B) the diastolic blood pressure is too low to deliver blood to the capillaries at a high flow rate C) the systemic capillaries are supplied by the left ventricle, which has a lower cardiac output than the right ventricle D) the total cross-sectional area of the capillaries is greater than the total cross-sectional area of the arteries or any other part of the circulatory system
Bacteriophages that integrate into the host's genome do so during a ________ cycle.
Fill in the blank(s) with the appropriate word(s).
What is a point mutation?
A) a mutation that affects only one metabolic pathway B) a mutation found at a single base pair in the genome C) a mutation that affects a single cell D) a mutation in which one chromosome is lost E) an error in DNA that is caused by malfunctioning of DNA ligase