MHT CET · BIOLOGY · STD 12 - 4. Molecular Basis of Inheritance

Select CORRECT statement from the following.

A In a DNA molecule, the two strands are anti-parallel and non-complementary.
B The rRNA is always present in variously folded form.
C During DNA replication, leading strand is formed in 3'→ 5', while lagging strand is formed in 5'→ 3' direction.
D The mRNA molecule may be straight of coiled upon itself to form a hairpin like shape.

Verified Solution

Answer & Solution

Correct Answer

(B) The rRNA is always present in variously folded form.

Step-by-step Solution

Detailed explanation

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Match the ecological terms given in Column I with its correct explanation in Column II.

Column I (Terms)	Column II (Explanation)
1. Stratification	a. Horizontal distribution of different species
2. Zonation	b. Rate of generation of Biomass in an ecosystem
3. Productivity	c. Breakdown of detritus
4. Decomposition	d. Vertical distribution of different species

Choose the correct option

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	Column I		Column II
i.	Monohybrid test cross	a.	1:2:1
ii.	Incomplete dominance	b.	1:2
iii.	Law of independent Assortment	с.	1:1
iv.	Sickle Cell Anaemia	d.	9:3:3:1