Select one of the options below and compare and contrast the paired terms:A
primary and secondary immune response
B. passive and active immunity
C. artificial and natural immunity What will be an ideal response?
A. The primary immune response is elicited upon first exposure to antigen. The secondary
immune response is elicited by secondary exposure to antigen. The secondary response is
faster and greater than the primary response. These observations are the basis of the significance of vaccination.
B. Passive immunity results from antibodies or specific immune cells delivered to a host
from a donor, e.g., from mother to fetus. Active immunity is when an individual exposed to
antigen develops antibodies and/or specific immune cells reactive with that antigen
C. Artificial immunity is induced by deliberate vaccination with a specific antigen. Natural
immunity is induced when a pathogen enters the body by natural encounters, such as a
sneeze.
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Why isn't oxygen produced by organisms that perform anoxygenic photosynthesis?
a. their photosystems do not utilize the Calvin cycle b. they use a different enzyme for the initial reactions of the Calvin cycle c. they use electron donors other than water d. their membranes lack ATP synthase e. their chlorophyll contains an iron center rather than magnesium
In the construction of a life table for colonial species in which most organisms do not reproduce, ____ is/are
considered as a reproductive individual.
a. each individual b. clusters of individuals c. the entire population in a geographical area d. the entire population on Earth e. each separate colony
Summer squash plants with the dominant allele C bear white fruit, whereas plants homozygous for the recessive allele c bear colored fruit. Summer squash have a second locus that acts as a modifier gene if the plant is colored. IF the plant is colored and is G-- at the second locus, they will be yellow. If they are colored and gg at the second locus, they will be green. What will the ratio of white to yellow to green squash be in a cross between a double heterozygous plant and a double homozygous recessive plant (CcGg x ccgg)?
a. 4:3:1 b. 2:1:1 c. 9:3:3:1 d. 1:4:6:4:1
Which of the following characteristics do all viruses have in common?
A. They all have a broad host range. B. They all infect eukaryotes. C. They all have DNA genomes. D. They all contain a capsid surrounded by a fatty envelope. E. They are all nonliving.