Respiration in Plants

During prolonged fastings, in what sequence are the following organic compounds used up by the body ?

• First carbohydrates, next fats and lastly proteins

• First fats, next carbohydrates and lastly proteins

• First carbohydrates, next proteins and lastly lipids

• First proteins, next lipids and lastly carbohydrates

Under which condition would you expect the mitochondrial proton gradient to be highest and therefore ATP synthesis to proceed?

• pyruvate (present)-oxygen (present)-ATP levels (high)

• pyruvate (present)-oxygen (present)-ATP levels (low)

• pyruvate (absent)-oxygen (present)-ATP levels (low)

• pyruvate (present)-oxygen (absent)-ATP levels (high)

Plants can get along without respiratory organs because of all the following except:

• Each plant part takes care of its own gas exchange needs

• Rate of respiration in root, stem, leaves is very low, hence no great demands for gas exchange

• Gas diffusion in plants occurs easily over long distances in plants

• Each living cell in a plant is located quite close to the surface of plant

Sucrose is converted into glucose and fructose. The enzyme which facilitates this reaction is called :

• Zymase

• Maltase

• Invertase

• Isomerase

Which of the following statements is incorrect?

• During aerobic respiration, role of oxygen is limited to the terminal stage.

• In ETC one molecule of NADH+H+gives rise to 2 ATP molecules, and one FADH2​ gives rise to 3 ATP molecules.

• ATP is synthesized through complex V

• Oxidation-reduction reactions produce proton gradient in respiration.

The number of substrate level phosphorylations in one turn of citric acid cycle is

• One

• Two

• Three

• Zero

Pyruvate dehydrogenase activity during aerobic respiration requires:

• Calcium

• Iron

• Cobalt

• Magnesium

Conversion of glucose to glucose-6-phosphate, the first irreversible reaction of glycolysis, is catalyzed by :

• Enolase

• Phosphofructokinase

• Aldolase

• Hexokinase

Respiratory Quotient (RQ) value of tripalmitin is

• 0.9

• 0.7

• 0.07

• 0.09

What is the role of NAD+ in cellular respiration?

• It is the final electron acceptor for anaerobic respiration.

• It functions as an enzyme.

• It is a nucleotide source for ATP synthesis.

• It functions as an electron carrier.