Consider the following statements about biotechnology: 1. Restriction enzymes cut DNA at specific sequences. 2. Ligase joins DNA fragments. 3. PCR amplifies DNA. Which of the above is/are correct? MCQ with Answer and Explanation
Consider the following statements about biotechnology:
1. Restriction enzymes cut DNA at specific sequences.
2. Ligase joins DNA fragments.
3. PCR amplifies DNA.
Which of the above is/are correct?
A. 1 and 2 only
B. 1, 2, and 3
C. 2 and 3 only
D. 1 and 3 only
Answer: Option B
Solution (By JKSSB Mock Tests)
Restriction enzymes cut DNA at recognition sites, DNA ligase seals fragments, and PCR amplifies specific DNA sequences. All three are fundamental tools in biotechnology.
Explanation:
Mitosis produces two genetically identical diploid daughter cells (clones) essential for growth, repair, and asexual reproduction. Meiosis involves pairing (synapsis) and crossing over during prophase I, and produces four genetically diverse haploid cells (gametes). The conservation of chromosome number and genetic identity is a hallmark of mitosis.
Explanation:
The colon (large intestine) primarily absorbs water, sodium, and some vitamins (produced by gut flora) from the indigestible food residue, converting it into semisolid feces. It does not secrete digestive enzymes; that is the small intestine's role. Protein digestion and amino acid absorption occur in the small intestine.
Explanation:
Emil Fischer proposed the lock-and-key model in 1894 to explain enzyme specificity. Koshland modified it to induced fit. Krebs discovered the citric acid cycle, Mitchell chemiosmosis.
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