For viewing which of the following would a scanning electron microscope not be the instrument of choice?
a. The complexity of T-even bacteriophages
b. The helical structure of deoxyribonucleic acid (DNA)
c. Human erythrocytes (red blood cells)
d. E. coli bacteria
Ans: b. The helical structure of deoxyribonucleic acid (DNA)
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The maintenance of a constant environment in a cell is called __________.
A. active transport B. homeostasis C. gene expression D. translation
List two especially useful characteristics of cloning vectors
A) high copy number and antibiotic resistance gene(s) B) nonautonomous replication and transposition C) virulence and lysogenicity D) ability to integrate into the host chromosome and then causing a lytic cycle E) reverse transcriptase and ligase activities
Please match the statement to the term that it most accurately describes, to test your understanding of types of symbiotic associations.
Mutualism A) Organisms living in obligatory but mutually beneficial relationships. B) One organism benefits while the other organism is neither harmed nor benefited C) One organism is harmed when it provides the other organism with nutrients and a habitat
Higher chromosome structure depends on:
A. SMC proteins, one of the major components of the chromosome scaffold. B. the formation of a chromosome scaffold by topoisomerases. C. the presence of the H1 protein, which promotes formation of the nucleoid. D. the formation of rosettes, which are stabilized by histone proteins. E. the formation of tetranucleosomes.