The statement 'cell death normally does not occur unless there has been an injury to the cell' is false.
A cell can be described as the basic building block of life. All living organisms are known to be made of cells.
There are various reasons that a cell might die. A cell might die when its function is over. A cell might also die for the formation of other structures in the body. For example, the formation of an outer layer of the skin requires dead cells. A cell might kill itself if it has no use or finds that it has been invaded by an antigen.
Hence, the statement that cell death occurs only due to injury is false as cell death can occur due to various other reasons.
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Answer:
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Within a six-base DNA recognition sequence, an enzyme that cuts between the 3rd and 4th bases from the 5' end will generate blunt ends.
a)True
b)False
a) True
What is the function of restriction endonucleases in bacteria?
a) They serve no function.
b)They allow bacteria to genetically recombine with other bacteria.
c) They allow bacteria to engineer new DNA fragments.
d)They provide a defense mechanism against infection by viruses.
Our answer is surely D
d)They provide a defense mechanism against infection by viruses.
Explanation:
Restriction enzyme/restriction endonuclease:
Are produced by bacteria for cleaveing DNA at specific sites. Restriction enzymes cleave foreign DNA in the bacterial cell to fight against infecting organisms.
Pls Note:
Restriction enzyme are used by
bacteria to defend against bacterial viruses called bacteriophages or phages
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