Answer:
The correct answer is b. recognizes foreign DNA sequences that have previously entered the cell and directs the Cas proteins to destroy them.
Explanation:
Clustered regularly interspaced short palindromic repeats (CRISPER) is the sequences of DNA found in the genome of prokaryotes and archaea. These sequences are added at a crisper locus in DNA by bacteria through capturing bacteriophage DNA during infection.
Then this sequence is used to detect a similar sequence of bacteriophage during subsequent infection and destroy them by Cas9 enzyme. Cas 9 enzyme uses a crisper sequence as a template to destroy similar phage DNA.
So the CRISPER Cas system provides an adaptive defense mechanism to bacteria against foreign DNA coming from bacteriophage. Therefore the correct answer is b.
I think the answer is 1, change ammonia into nitrates.
Only B. illustrates a positive feedback mechanism. A. demonstrates a negative feedback mechanism, while C. demonstrates no feedback mechanism at all.
Answer:
The respiratory system is best described as <em>bloodstream and takes away carbon dioxide</em>
Explanation:
Respiratory system entails the inhalation of oxygen and exhalation of carbondioxide which is useful for plant for production of their food. Every living organisms respires, hence; oxygen is required to sustain life unless death looms
