Which of the following bacterial hosts should be used to avoid degradation of DNA that is introduced via a cloning vector?

A. Saccharomyces cerevisiae wild type cells
B. RecA-expressing Escherchia coli
C. Escherchia coli RecA mutants
D. Escherichia coli that lack endonucleases 


Answer: D

Biology & Microbiology

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What type of cell communication is said to occur if a cell secretes a growth factor that then acts on neighboring cells to cause them to proliferate?

A. contact-to-contact signaling B. intercellular signaling C. autocrine signaling D. paracrine signaling E. endocrine signaling

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Babies were accidentally switched at the hospital! Mr. and Mrs. Fire both have type O blood. Which of the following four babies of the same age is most likely the Fire child?

A) baby with type A B) baby with type B C) baby with type AB D) baby with type O

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A cell membrane is said to be a fluid mosaic because

A. there is water in the membrane. B. the membrane is made of lipids and proteins that can move. C. it forms a bilayer. D. transport proteins allow for the movement of water-soluble molecules.

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An individual who works in construction and is exposed to years of loud noises, below 75 decibels, will most likely develop a decease in hearing function. The structures that are damaged are the

A. organ of Corti. B. round window. C. auditory canal. D. tympanic membrane. E. stereocilia of the spiral organ.

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