Question

Study the following statements carefully and select the correct option.

Statement -1 : The value of the product (4a² + 3b) (4a² + 3b) at a = 1 and b = 2 is 100.

Statement -2 : Value of
$\dfrac{(997 + 496) {}^{2} - (997 - 496) {}^{2} }{997 \times496}$is 2.

(A) Both statement -1 and statement -2 are true.
(B) Statement -1 is true but statement -2 is false.
(C) Statement -1 is false but Statement -2 is true.
(D) Both statement -1 and -2 are false.
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Answer 1

Answer:

correct answer is (B) statement -1 is true but statement -2 is false.

Answer 2

How do cells make accurate copies of DNA ?

Ans :- When a cell divides, it replicates its DNA by splitting apart double-stranded DNA and makes new copies along the single strands of the original DNA. ... By always keeping the original DNA strands, it ensures that it maintains the original information.