The 'eclipse phase' in the virus one-step growth curve can be defined or described as:
A. The extra-cellular phase of the virus- where it is metabolically inert
B. The period before the virus has attached to the host cell
C. A period where there are no infectious virus particles in the cells or in the culture.
D. The time it takes a virus to be transmitted from one host to another
Ans: C. A period where there are no infectious virus particles in the cells or in the culture.
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The Golgi complex ____
a. receives proteins made in the rough ER and chemically modifies them b. synthesizes proteins for export from the cell c. stores nucleic acids d. synthesizes lipids e. stores ribosomes
An interaction in which one species benefits
and the second species is neither harmed nor benefited is a. mutualism. b. parasitism. c. commensalism. d. competition. e. predation
What is wood?
A. Secondary xylem that has accumulated outside a cylinder of vascular cambium B. Secondary xylem that has accumulated inside a cylinder of vascular cambium C. Primary xylem that has accumulated outside a cylinder of vascular cambium D. Primary xylem that has accumulated inside a cylinder of vascular cambium E. Vascular cambium cells
Cystic fibrosis (CF) is caused by a recessive allele. A child has CF, even though neither of his parents has CF. Which of the following describes the genotypes of the parents?
A) One is homozygous recessive for the CF gene, and the other is heterozygous. B) They are both heterozygous for the CF gene. C) They are both homozygous dominant for the CF gene. D) One is homozygous dominant for the CF gene, and the other is heterozygous. E) They are both homozygous recessive for the CF gene.