A nuclease (also archaically known as nucleodepolymerase or polynucleotidase) is an enzyme capable of cleaving the phosphodiester bonds between nucleotides of nucleic acids. Nucleases variously effect single and double stranded breaks in their target molecules. In living organisms, they are essential machinery for many aspects of DNA repair. Defects in certain nucleases can cause genetic instability or immunodeficiency.[1] Nucleases are also extensively used in molecular cloning.[2]
Depiction of the restriction enzyme (endonuclease) HindIII cleaving a double-stranded DNA molecule at a valid restriction site (5'–A|AGCTT–3').
There are two primary classifications based on the locus of activity. Exonucleases digest nucleic acids from the ends. Endonucleases act on regions in the middle of target molecules. They are further subcategorized as deoxyribonucleases and ribonucleases. The former acts on DNA, the latter on RNA.[2]
Answer:
Controlled experiments
Explanation:
Controlled experiments are those experiments where all variables are identical but only one is different. The purpose of such experiments is to test a hypothesis by analyzing the change it brings to results due to change of only one variable when everything else is constant. SO we can say that in such experiments, it is the only changing variable which is influencing the results of an experiment because everything else is just same.
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Answer:
The evolution of the pillar coral as an organism dependent on the zooxanthellae can be demonstrated by an experiment conducted by the student.
Explanation:
Zooxanthellae are photosynthetic algae which reside in the tissues of most of the reef-building corals. Both of this exhibit mutualistic relationship where in the corals protect the algae and also provide the necessary compounds for photosynthesis. The algae in return of this, produces and provides oxygen and also helps the coral remove its wastes. A student can conduct an experiment on this phenomenon of mutualistic behaviour by removing the zooxanthellae from the corals which may even kill the coral.