Test: Vitamins, Nucleic Acid and Hormones (March 3) - NEET MCQ

The correct answer is option B
Calcitriol , is the hormonally active metabolite of vitamin D  which has three hydroxyl groups.Calcitriol increases the level of calcium  (Ca2+) in the blood  by increasing the uptake of calcium from the gut  into the blood, increasing reabsorption of calcium by the kidneys, and possibly increasing the release of calcium into the blood from bone. Vitamin D has a significant role in calcium homeostasis  and metabolism. Its discovery was due to effort to find the dietary substance lacking in children with rickets  (the childhood form of osteomalacia).

The correct answer is Option C
Fat soluble vitamin - A, D, E, K
Water soluble vitamin - Vitamin B complex and C
So, vitamin B is water soluble.
Vitamins which can dissolve in water are called water-soluble vitamins. Water-soluble vitamins include vitamin-C and vitamin-B because they remove the toxins from our body through urine. Therefore, they are not stored in our body and should be taken on a daily basis through the food we eat.

The correct answer is option  B
Ultimate product of hydrolysis of protein is amino acid. Proteins are polymers made up of several amino acids. These amino acids are linked through peptide bonds. On hydrolysis, peptide bonds are broken and amino acids are released.

RNA can directly control the synthesis of proteins, hence can easily express the characters. DNA, however, is dependent on RNA for synthesis of proteins. The protein synthesising machinery has evolved around RNA.

In DNA, four bases have been found. They are adenine (A), guanine (G), cytosine (C) and thymine (T). The first three of these bases are found in RNA also but the fourth is uracil (U). RNA contains cytosine and uracil as pyrimidine bases while DNA has cytosine and thymine. Both have the same purine bases i.e. guanine and adenine.

Each type of RNA functions differently, among them mRNA which is also known as messenger RNA carries genetic information from DNA in the form of series of a three-base codon, which specifies the amino acid.

DNA differs from RNA because DNA has deoxyribose sugar while RNA has ribose sugar. DNA has thymine as pyrimidine while, in RNA thymine is replaced by uracil.So, the correct answer is 'In the nature of sugar and pyrimidines'

Both nucleotide and nucleoside have pentose sugar and nitrogenous base. Nucleotide differs from nucleoside with the presence of phosphoric acid as nucleoside do not have phosphoric acid.

Each nucleotide base can hydrogen-bond with a specific partner base in a process known as complementary base pairing: Cytosine forms three hydrogen bonds with guanine, and adenine forms two hydrogen bonds with thymine.

Formaldehyde  is a recipient of the one carbon fragments that tetra hydro folate receives and transfers