In order to replicate within a host cell, a virus with a genome comprised of single-stranded positive-sense RNA
A. must use its genomic strand as a template to make copies of negative-sense RNA for packaging.
B. must first use its genomic strand as a template to make copies of DNA for packaging.
C. must use its genomic strand as a template to make copies of positive-sense RNA for packaging.
D. must first use its genomic strand as a template to make a negative-sense RNA, which then serves as a template to synthesize positive-sense RNA for packaging.
Answer: A
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The dose of an antigen that kills 50% of animals in a test group and is used to estimate the virulence of a pathogen is known as
A) Antigen dose50. B) Virulence-50. C) LD50 (lethal dose50). D) Death rate-50.
The wobble of the Earth is not causing the current warming trend because it takes place on a scale of
A) 410 years. B) 4100 years. C) 41,000 years. D) 410,000 years.
G protein-linked receptors are transmembrane proteins that convert a(n) extracellular hormone signal into an
intracellular signal that affects certain cell processes. Indicate whether the statement is true or false.
The destruction of a field of cotton plants by a flood is an example of an ___________ limiting factors.
A. intrinsic and density-dependent B. intrinsic and density-independent C. extrinsic and density-dependent D. extrinsic and density-independent