Answer:
B
Explanation:
CRISPR-Cas9 is a gene-editing mechanism that is harnessed from bacteria’s immune system used to cut apart foreign genetic material such as that of bacteriophages. CRISPR-Ca9 has a guide sequence that is used to identify the target sequence. The Cas9 enzyme cuts this target DNA and is replaced with the required piece.
In cancer treatment, the mutated DNA can be replaced, this way, with the wild type.
It is caused by algae.
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Answer:
D) refractory period
Explanation:
Electrical Muscle Stimulation is caused by the electrical impulses from brain that allows muscles to contract. A neurotransmitter junction between cells and neuron is presnet which cause action potential for muscle conraction.
The refractory period is the time when the cell is repolarizing. During refractory period cells re nable to repat its action and takes time to prepare the membrane for next stimulation. An action potential can't be transmitted until there is a potential across the membrane again.
Hence, refractory period is the time during which muscle is unable to respond to the stimuli.