The Bcl-2 gene product in its normal form can be activated to prevent cells from undergoing apoptosis (programmed cell death) in specific circumstances. It is a carefully regulated gene, being "turned on" only under specific circumstances
A null mutation in Bcl-2 leads to excessive cell loss. Some Bcl-2 mutation can cause a "gain of function" in which the protein is active all the time. a. In the terms used in this chapter, what would the normal version be called? b. What would the gain-of-function mutation be called? c. How would you expect the gain-of-function mutation to be involved in cancer?
(a) A proto-oncogene.
(b) An oncogene.
(c) The gain-of-function mutation could cause abnormal cells to fail to commit suicide when their genome has been irreparably damaged. As a result, these cells could mutate into cancer cells.
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The realized niche for the green anole was determined by:
a. a limiting resource. b. competition. c. symbiosis. d. coevolution. e. disease
What is the general term for observable changes in cells that occur as a result of the viral infection?
A) cytopathic effects B) inclusion bodies C) syncytium D) transformation bodies
In the solar panel system presented in the video, which of the following was necessary to generate usable electrical current for a home?
A- Electrical energy had to be stored in batteries for several days. B- DC power had to be converted to AC. C- The electrical energy had to be converted to nuclear energy. D- The heat of the sun had to be used to generate steam.
What is the function of the Z ring in binary fission?
A. It controls the replication of DNA. B. It forms a contractile ring at the septum. C. It separates the newly synthesized DNA molecules. D. It mediates the addition of new peptidoglycan subunits.