The subatomic particle(s) with a negative charge
is(are)
a. the neutron.
b. the proton.
c. the electron.
d. both the neutron and proton.
e. both the proton and electron.
Answer: c
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A plot of population size vs time that displays a J-shape is indicative of
A. parasitism. B. exponential growth. C. logistic growth. D. K-selection. E. r-selection.
Arrange the steps of antibody-mediated immunity in the proper order
1) Plasma cells secrete antibodies. 2) Helper T cells interact with B cells displaying the same antigen-MHC complex. 3) Contact with antigen. 4) Clones of B cells produced. 5) Fragmentation of antigen.
a. 3, 2, 5, 1, 4 b. 3, 5, 2, 4, 1 c. 1, 3, 5, 2, 4 d. 4, 3, 2, 1, 5 e. 5, 3, 4, 2, 1
Hemophilia A is
A. an X-linked dominant disorder. B. an X-linked recessive disorder. C. an X-linked recessive disorder, causing a defective blood clotting protein. D. an X-linked dominant disorder, causing a defective blood clotting protein. E. a defective blood clotting protein.
The main reason scientists thought that proteins, rather than DNA, were the carriers of genetic material
in the cell was:a. their presence within the nucleus. b. their abundance within the cell. c. the large number of possible amino acid combinations. d. their ability to self replicate within the cytoplasm. e. their ability to be exported from the cell.