Which two levels are farthest apart on the hierarchy of biological organization?
a. Organism and population
b. Ecosystem and biosphere
c. Atom and cell
d. Tissue and organ
Answer: c. Atom and cell
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Supercoiling of double-stranded DNA is called its ______________ structure
A. primary B. secondary C. tertiary D. quaternary E. duplex
Structures used in recombinant DNA technology to carry the DNA from the cells of one species to the cells of another species are
A) cloning vectors. B) restriction enzymes. C) sticky ends. D) donor DNA.
Which of the following statements is false?
a. Only B cells and their progeny make antibodies. b. The primary immune response is faster and more complete than a secondary immune response. c. Naive B cells already have antibodies but have not yet encountered an antigen. d. Macrophages will digest invading bacterial cells but do not destroy the antigens that eventually become mounted on their surfaces. e. B cell progeny may differentiate into memory cells.
The genotype of an organism that expresses a dominant trait can be determined by:
A: crossing the organism with a homozygous recessive organism. B: crossing the organism with a heterozygous dominant organism. C: crossing the organism with a homozygous dominant organism. D: observing the phenotype of the progeny from any cross. E: observing the genotype of the progeny from any cross.