The technique of using radioactive probes to detect specific DNA sequences on a membrane is:
A. ELISA
B. Flow cytometry
C. Southern blotting
D. PCR
Answer: Option C
Solution (By JKSSB Mock Tests)
Southern blotting involves separation of DNA fragments by gel electrophoresis, transfer to a membrane, and hybridization with a labeled probe. PCR amplifies DNA, ELISA detects proteins, flow cytometry analyzes cells.
Assertion (A): Viruses are considered obligate intracellular parasites. Reason (R): They lack their own metabolic machinery and require a host cell to multiply.
A.Both A and R are true, but R is not the correct explanation.
B.A is true, but R is false.
C.Both A and R are true, and R is the correct explanation of A.
Explanation:
Viruses are non-living outside a host; they cannot carry out metabolic processes or reproduce independently. They hijack the host cell's machinery to replicate. Thus, they are obligate intracellular parasites. The reason correctly explains the assertion.
Explanation:
Certain high-risk strains of HPV are a major cause of cervical cancer. Vaccines are available. TB is bacterial, malaria protozoan, cholera bacterial.
Explanation:
The kidneys sense low oxygen levels and secrete erythropoietin (EPO), which stimulates red blood cell production in the bone marrow. The liver also produces some EPO in fetal life. Bone marrow is the target, not producer.
No comments yet. Be the first to start the discussion!