Nucleotides

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1. Purines & Pyrimidines Are Dietarily essential

True

False

Ingested nucleic acids are degraded while injected compounds are incorporated into tissue nucleic acids

Explanation

Ingested nucleic acids are degraded while injected compounds are incorporated into tissue nucleic acids

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2. Second messenger in Nitric oxide induced signal cascade is

CAMP

CGMP

IP3/Ca

None

Only NO, ANP uses cGMP as 2nd messenger

Explanation

Only NO, ANP uses cGMP as 2nd messenger

3. 3 prime in 3'-GMP indicates

Position of the phosphate on the sugars

Position of double bond

Both

None

4. All the common nucleotides absorb light at a wavelength close to

260 nm

480 nm

560 nm

380 nm

5. Pseudouridine is a

Base

Nucleoside (base + sugar)

Nucleotide (base+sugar+phosphate)

None

Pseudouridine is excreted in urine as such.

Explanation

Pseudouridine is excreted in urine as such.

6. Aromatic amino acids like tyrosine and tryptophan absorb light at a wavelength close to

280 nm

380 nm

480 nm

560 nm

That is why ratio of the absorbance at 260 and 280nm (A260/280) is used to assess the purity of nucleic acids.
For pure DNA, A260/280 is ~1.8 and for pure RNA A260/280 is ~2

Explanation

That is why ratio of the absorbance at 260 and 280nm (A260/280) is used to assess the purity of nucleic acids.
For pure DNA, A260/280 is ~1.8 and for pure RNA A260/280 is ~2