An organism living in the bottommost region of a body of water is described as being
A) benthic.
B) litoral.
C) neritic.
D) pelagic.
Answer: A
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Which of the following techniques exemplifies phenotypic rescue in a host cell?
A. Introducing a genomic library from a mutant cell auxotroph for a particular gene product into a host cell that can synthesize that product constitutively. B. Replacing a mutant gene with a functional gene in a DNA library from an auxotrophic mutant cell prior to introducing the library into a related host cell. C. Removing genes that encode a particular gene product from a cell that expresses that product constitutively before creating a genomic library. D. Introducing a genomic library from a cell that produces a particular gene product into a mutant host cell auxotroph that cannot synthesize the product.
Consider a population undergoing logistic growth. When (K-N)/K = 0, what does that imply about the birth rate (b) and death rate (d)?
A. b > d B. b < d C. b = d D. It is not possible to make an inference about b and d from this information.
Which of the following describes a trophoblast?
a. the outer layer of blastocyst cells b. a combination of Z and W chromosomes c. the inner layer of blastocyst cells d. a fertilized egg retained in the female
____ helps defend plants against viral infection
a. Systemin b. Jasmonates c. Brassinosteroids d. Methyl salicylate e. Oligosaccharins