The mechanical destruction and/or chemical modification of rock into smaller particles is called
A) leaching.
B) mineralization.
C) percolation.
D) weathering.
D
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Which excitatory neurotransmitter is responsible for muscle contraction in vertebrates?
A. dopamine B. norepinephrine C. nitrous oxide D. glutamate E. acetylcholine
Vectors can transfer ____
a. DNA sequences into bacterial host cells for cloning b. DNA sequences into viral host cells for cloning c. cloned viral cells into a bacterial host for cloning d. cloned mitochondria from donor cell to host cell e. cloned chromosomes from the nucleus of a cell into its cytoplasm
Which of the following statements is incorrect about shigellosis?
A. It frequently complicates to sepsis. B. Outbreaks have occurred in day care centers. C. It is also called dysentery. D. Symptoms include watery diarrhea with bloody, mucoid stools and abdominal cramps. E. Human carriers cause fecal transmission.
With regards to operons, which of the following is incorrect?
A. operons have a promoter that contains an operator B. are typically controlled by a regulatory gene that is located far from the actual operon C. results in several different RNA molecules each leading to the protein specified by each gene segment in the operon D. may be turned on or off E. may be repressible or inducible