40. The \'bicyclic\' bases of nucleic acids are known as__. A. pyrimidines B. pu
ID: 274262 • Letter: 4
Question
40. The 'bicyclic' bases of nucleic acids are known as__. A. pyrimidines B. purine 41. Which of the following bases is NOT found in ribonucleic acids? A. adenine B. thymine C. uridine D. cytosine E. guanine 42. Which form of DNA is classified as a left-handed double helix? A. A-DNA B. B-DNA C. Z-DNA D. cruciform DNA E.hairpi DNA 43. Which of the following structural arrangements is NOT categorized as a 2° structure? A. tRNA B. B-DNA C. alpha helix D. cruciform DNA E. hairpin DNA 44. Which of the following reaction types is used to gain energy during metabolism? A. combustion B. esterification C. hydrolysis D. reduction E. protonation 45. The energy used in metabolism is best described by which term? A. Gibbs free energy B. enthalpy C. entropy D. heat E. internal energyExplanation / Answer
Solutions
40. The ‘bicyclic’ bases of nucleic acids are known as Pyrimidines (option A).
Purines are homocyclic bases
41. The correct answer is Option B – Thymine
RNA contains the following bases – Adenine, Guanine, Cytosine and Uracil ( in place of thymine)
42. The correct option is Option C – ‘Z-DNA’
Remaining options are examples of right-handed helices.
43. The correct option is Option A – tRNA
A secondary structure is one in which there is complementary base pairing between adjacent nucleotides.
44. The correct option is Option C- Hydrolysis.
In most of the metabolic reaction, the cells hydrolyse a molecule called ATP to release the chemical energy that has been stored in the high-energy phosphoanhydride bonds. Water molecules and enzymes are involved in the reaction.
45. The correct option is Option E –Internal energy.
This is the energy contained within the system, and is released during splitting up of the molecule. In case of metabolic reactions, this is usually the case of ATP hydrolysis leading to generation of energy.
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