MCQs

Ribonucleoside monophosphates (ribonucleotides) link together via condensation reactions to build the polymeric RNA strand.

Uracil pairs with adenine via two hydrogen bonds during transcription, mirroring the adenine-thymine interaction in DNA.

Purines are double-ringed nitrogenous bases, which include adenine and guanine in both DNA and RNA.

The 3' end of tRNA terminates in a conserved CCA sequence, where the hydroxyl group of the terminal adenine binds to an amino acid.

Messenger RNA is synthesized as a single-stranded linear molecule to allow ribosomes to read its codons sequentially.

Ribosomal RNA is the most abundant form of RNA in the cell because ribosomes are present in vast numbers to meet translational demands.

Messenger RNA (mRNA) serves as a linear transcript of the genetic blueprint to guide amino acid sequencing during translation.

The nucleolus is a specialized region within the nucleus dedicated to the transcription of rRNA and the assembly of ribosomal subunits.

Phosphodiester bonds form the sugar-phosphate backbone by connecting the 3' carbon of one ribose to the 5' carbon of the next.

Uracil is a pyrimidine base specific to RNA that pairs with adenine, replacing the thymine found in DNA.

Ribose contains a hydroxyl group (-OH) at the 2' carbon position, distinguishing it from deoxyribose which has a hydrogen atom instead.

Stoichiometric mixture. H₂ produced = 0.3 mol. Volume = 6.72 dm³.

The limiting reactant determines how much of the excess reactant is used.

Carbon is limiting. CH₄ = 1.5 mol. Mass = 24 g.

Stoichiometric mixture. Titanium formed = 1 mol = 48 g.

The limiting reactant determines the maximum product obtainable.

HCl is limiting. CaCl₂ formed = 0.5 mol. Mass = 55.5 g.

N₂ is the limiting reactant and is completely consumed.

SO₂ is limiting. SO₃ formed = 2 mol. Mass = 160 g.