Tag: bio-chemistry

Quizzes (82) Questions (1918)

Questions Related to bio-chemistry

Multiple choice bio-chemistry respiration in organisms glucose metabolism the need for energy in living organism respiratory function

Substrate -level phosphorylation accounts for approximately what percentage of the ATP formed by the reactions of glycolysis?

  1. $0\%$
  2. $2\%$
  3. $10\%$
  4. $100\%$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Substrate-level phosphorylation is the direct transfer of phosphate group to ADP to form ATP. It accounts of 100% of the ATP formed by the reactions of glycolysis. The first substrate-level phosphorylation occurs when 1, 3 - diphosphoglyceraldehyde is converted to 1, 3 - diphosphoglyceric acid and 2 NADH$ _2$ are formed, that is 6 ATP are formed. The 1, 3-diphosphoglyceric acid is then dephosphorylated to 3 phosphoglyceric acid producing 2 ATP via substrate-level phosphorylation. The second substrate-level phosphorylation occurs when phosphoenolpyruvic acid is converted to pyruvic acid producing 2 ATP molecules.

Thus, the correct answer is option D. 

Multiple choice bio-chemistry carbohydrate metabolism glucose metabolism the need for energy in living organism respiratory function

Which hormone secreted by thyroid gland ?

  1. Thyroxine

  2. Adrenalin

  3. Testosterone

  4. Phyrotrophic
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The thyroid gland is composed of two lobes that are located on either side of the trachea.
  • Follicular cells of the thyroid gland synthesize two hormones, tetraiodothyronine or thyroxine ($T _4$) and triiodothyronine ($T _3$). 
  • Thyroid hormones play an important role in the regulation of the basal metabolic rate. 
  • Hence the hormone secreted by the thyroid gland is thyroxine.
  • So, the correct answer is 'Thyroxine'.
Multiple choice bio-chemistry the respiratory system glucose metabolism the need for energy in living organism respiratory function

Glycogenolysis is

  1. Oxidation of sugar

  2. Conversion of glycogen into glucose

  3. Conversion of glucose into glycogen

  4. Conversion of glycogen into fat
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Glycogenolysis is the biochemical pathway by which glycogen is broken down into glucose-1-phosphate and glucose to provide energy or maintain blood sugar levels.

Multiple choice bio-chemistry the respiratory system glucose metabolism the need for energy in living organism respiratory function

Column I contains some terms and Column II contains their
meanings. Match them properly and choose the right answer

Column I Colunn II
A Glycogenesis 1 Conversion of glycogen toglucose
B Glycosuria 2 Conversion of glucose toglycogen
C Gluconeogenesis 3 Excretion of glucose in urine
D Glycogenolysis 4 Conversion ofnoncarbohydrate sources toglucose
5 Conversion of glucose tostarch













  1. A-1, B - 2, C - 3, D - 4

  2. A - 2, B - 3, C - 4, D -1

  3. A - 2, B - L C - 3, D -4

  4. A -1, B - 5, C - 2, D -4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Glycogenesis is glucose to glycogen (A-2). Glycosuria is glucose in urine (B-3). Gluconeogenesis is non-carbohydrate to glucose (C-4). Glycogenolysis is glycogen to glucose (D-1).