The outer membranes of bacteria, mitochondria, and chloroplasts contain large nonselective channels made of multipass proteins known as ________ in which the transmembrane segment of the protein is composed of a ________
Fill in the blank with correct word.
Answer: porins; β-barrel
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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.
In an agricultural field where pesticides are regularly sprayed, there are always some insects
that survive due to some innate resistance based on their genetic makeup. These are the ones that then reproduce so that in future generations there are more insects/pests that are resistant to the pesticides. Over time, this may give rise to an entire population that is resistant to the pesticide. This is an example of
a. homology. b. natural selection. c. experimentation. d. classification
Which of the following statements concerning anabolic reactions is FALSE?
a. They are generally endergonic. b. They usually require ATP. c. They are part of metabolism. d. They may produce polysaccharides from monosaccharides. e. They may split complex molecules into their components.
Fill in the blanks to complete the following statements. ?Tuberculosis, botulism, and tetanus are examples of diseases caused by rod-shaped bacteria known as ______________
Fill in the blank(s) with correct word