MCQ
Krebs' cycle takes place in:
- ACytoplasm
- BChloroplast
- CNucleus
- DMitochondria
Explanation:
Kreb's cycle takes place in the mitochondrial matrix.
The pyruvate formed by the reduction of glucose in the glycolysis is broken into acetyl-CoA which enters the Kreb's cycle and condenses with oxaloacetate to form citrate.
One pyruvate molecules produce 15 ATP and two pyruvate molecules lead to the production of 30 ATP.
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$(i)$ It is ten enzymatic reactions that convert a six-carbon molecule to a three carbon pyruvate and result in a net gain of $2\, ATP$ molecules.
$(ii)$ Glucose undergoes partial oxidation to form one molecule of pyruvic acid.
$(iii)$ Glucose is phosphorylated to give rise to glucose $- 6 -$ phosphate by the activity of the enzyme phosphofructokinase.
$(iv)$ The scheme of glycolysis was given by Gustav Embden, Otto Morrison, and $J$. Parnas and is often referred to as the $EMP$ pathway.
$(v)$ $ATP$ is utilized at two steps: first in the conversion of glucose into glucose $6-$ phosphate and second in the conversion of fructose $- 6-$ phosphate to fructose $1, 6-$ disphosphate
| List $I$ | List $II$ |
| $A$ Unicellular glandular epithelium | $I$ Salivary glands |
| $B$ Compound epithelium | $II$ Pancreas |
| $C$ Multicellular glandular epithelium | $III$ Goblet cells of alimentary canal |
| $D$ Endocrine glandular epithelium | $IV$ Moist surface of buccal cavity |
choose the correct answer from the options given below:
$(i)$ Cristae of mitochondria $(ii)$ Inner membrane of mitochondria $(iii)$ Cytoplasm $(iv)$ Smooth endoplasmic reticulum $(v)$ Rough endoplasmic reticulum $(vi)$ Mitochondrial matrix $(vii)$ Ribosome $(viii)$ Nucleus