What is the difference between a "knockout" and a "knockdown" of a gene?
What will be an ideal response?
Both terms refer to the alteration in the transcription from a gene, the difference being the level of transcription. In a knockout, the gene is not transcribed at all, whereas in a knockdown there is some transcription, usually well below the normal level.
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Four of the five structures listed below are innervated
by the autonomic nervous system. Select the exception. a. skeletal muscles b. smooth muscles c. heart d. endocrine glands e. exocrine glands
The reduction in organ blood flow that results from a decrease in mean arterial pressure would be exacerbated by the ________ that occurs as a consequence of the baroreceptor reflex.
A) increased stroke volume B) increased venous return C) decreased compliance of the veins D) increased ventricular contractility E) increased peripheral resistance
In phloem, bulk flow occurs from regions of high to low ________ concentration.
A. solute B. mineral C. water D. cytosol E. cytoplasm
What is an adaptation?
A. A specialized feature B. The accumulation of favorable traits over time C. The result of natural selection D. All of the above are correct