Assertion (A): Restriction enzymes are used in recombinant DNA technology. Reason (R): They cut DNA at specific recognition sequences. MCQ with Answer and Explanation
Assertion (A): Restriction enzymes are used in recombinant DNA technology.
Reason (R): They cut DNA at specific recognition sequences.
A. A true, R false.
B. A false, R true.
C. Both A and R are true, and R is the correct explanation.
D. Both A and R are true, but R is not the correct explanation.
Answer: Option C
Solution (By JKSSB Mock Tests)
Restriction endonucleases cut DNA at specific palindrome sequences, generating sticky or blunt ends, which can be ligated to vector DNA. This is the basis of genetic engineering. R explains A.
Explanation:
Iron is the central atom of heme in hemoglobin, essential for binding oxygen. Magnesium is in chlorophyll, calcium in bones and signaling, phosphorus in ATP and bones.
Consider statements about the human heart: 1. The left ventricle has the thickest wall. 2. The tricuspid valve is between the left atrium and ventricle. 3. The SA node is the natural pacemaker. Which are correct?
Explanation:
The left ventricle has the thickest muscular wall to pump blood at high pressure into the systemic circulation. The sinoatrial (SA) node generates impulses spontaneously, acting as the natural pacemaker. The tricuspid valve is located between the right atrium and right ventricle; the bicuspid (mitral) valve is on the left side. Thus, statements 1 and 3 are correct.
Explanation:
The thymus gland is a primary lymphoid organ where T lymphocytes mature and become self-tolerant. Bone marrow is where B cells mature; spleen and lymph nodes are secondary.
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