Tag: the respiratory system

Quizzes (15) Questions (110)

Questions Related to the respiratory system

Multiple choice parts of respiration cellular respiration the respiratory system breathing for energy biology types of respiration

Hydrogen acceptor in cellular respiration is 

  1. NAD

  2. FAD

  3. NADP

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

NAD (Nicotinamide adenine nucleotide) is an electron carrier. It is reduced by accepting a single hydrogen atom and an electron pair from H$ _2$ atom and other electron freed into the medium. NAD is reduced to NADH in citric acid cycle and glycolysis.
FAD (Flavin adenine dinucleotide) is an electron carrier. It is reduced by accepting a full hydrogen H$ _2$ atom. The FAD is reduced to  FADH$ _2$ in the citric acid cycle.
NADP is also an electron carrier. NADP is reduced into NADPH in the photosynthesis.
So, the correct answer is ' NAD & FAD '.

Multiple choice parts of respiration cellular respiration the respiratory system breathing for energy biology types of respiration

For glycolysis to continue,all cells require

  1. O2

  2. Mitochondria

  3. ETS

  4. NADP+
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Glycolysis is the only process of extraction of energy in anaerobic organisms. Thus, It never requires O$ _2$ for its completion. Since the process takes place solely in cytoplasm so never requires any other organelle for its completion. As ETS takes place in mitochondria so it never takes part in glycolysis. For uninterrupted working of glycolysis, we require NADP$^+$ as it is required for the production of NADP$^+$+H$^+$ during conversion of 3-Phosphoglyceraldehyde to 1,3-bisphospho glyceraldehyde. 

So, the correct answer to the question is 'NADP$^+$'.

Multiple choice parts of respiration cellular respiration the respiratory system breathing for energy biology types of respiration

The net gain of ATP molecules through glycolysis is

  1. 6

  2. 4

  3. 8

  4. 36
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Although four ATP molecules are produced in the second half, the net gain of glycosis is only two ATP because two ATP molecules are used in the first half of glycosis.
Glycosis produces 2 ATP, 2 NADH, and 2 pyruvate molecules.
2ATP + 2 NADP $\rightarrow$ 8 ATP
So, the correct answer is '8 ATP'.
Multiple choice parts of respiration cellular respiration the respiratory system breathing for energy biology types of respiration

Glycolysis is a:

  1. Redox process

  2. Aerobic process

  3. Oxidative process

  4. Reductive process
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

Glycolysis is a redox as well as an aerobic process. It takes place in presence of oxygen that's why this process is known as an aerobic process. In glycolysis oxidation as well as reduction takes place that's why this process is also known as redox process.


So, the correct answer is 'Glycolysis is a redox as well as an aerobic process'.

Multiple choice parts of respiration cellular respiration the respiratory system breathing for energy biology types of respiration

Which of the following steps of respiration is amphibolic?

  1. Glycolysis

  2. Oxidative decarboxylation of pyruvate

  3. TCA cycle

  4. Oxidative phosphorylation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The term amphibolic is used to describe a biochemical pathway that involves both catabolism and anabolism. These are the most common ways smaller organic molecules can be formed into more complex ones and applies to the formation of carbs, proteins, lipids, and nucleic acids. Other type called reduction reaction, which involves the adding of hydrogens and electrons to a molecule. it gains calories of energy because energy is released when a hydrocarbon bond is split. Pathways of glycolysis are amphibolic pathways because they provide ATP and chemical intermediates to build new cell material. The fundamental metabolic pathways of biosynthesis are similar in all organisms, in the same way, that protein synthesis or DNA structure are similar in all organisms.

So the correct option is 'glycolysis'.

Multiple choice parts of respiration cellular respiration the respiratory system breathing for energy biology types of respiration

Which of the following is the major regulatory enzyme of Glycolysis?

  1. Hexokinase

  2. phosphofructokinase

  3. aldolase

  4. phosphor-triose-isomerase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • In first step of glycolysis, glucose is converted in to glucose -6- phosphate by the enzyme Hexokinase or Glucokinase.
  • Hexokinase is available for all cell where as Glucokinase acts only for liver cell.
  • It also require magnesium as cofactor.
  • Hexokinase is the major regulatory enzyme of Glycolysis.
Hence, the correct answer is 'Hexokinase'

Multiple choice parts of respiration cellular respiration the respiratory system breathing for energy biology types of respiration

During respiration, pyruvate is formed ________.

  1. When oxygen takes part in the process

  2. When oxygen does not take part in the process

  3. Irrespective of oxygen taking part in the process

  4. When mitochondria take part in the process
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pyruvate is the end product of glycolysis, which is the initial common pathway for cellular respiration that occurs in the cytoplasm. Glycolysis does not require oxygen, meaning pyruvate is formed irrespective of whether oxygen is present or absent.

Multiple choice parts of respiration cellular respiration the respiratory system breathing for energy biology types of respiration

Maximum energy is released during conversion of?

  1. Glucose into pyruvic acid
  2. Glucose into ethyl alcohol and $CO _2$

  3. Pyruvic acid into acetyl CoA
  4. Pyruvic acid into $CO _2$ and $H _2O$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Complete aerobic respiration of pyruvic acid into carbon dioxide and water releases the maximum amount of energy through the citric acid cycle and oxidative phosphorylation. Earlier steps like glycolysis or partial fermentation retain much of the energy within intermediate organic molecules.

Multiple choice parts of respiration cellular respiration the respiratory system breathing for energy biology types of respiration

During the stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP.

  1. Glycolysis

  2. Krebs cycle

  3. Conversion of pyruvic acid to acetyl Co-A

  4. Electron transport chain
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Glycolysis, part of cellular respiration, is a series of reactions that constitute the first phase of most carbohydrate catabolism, catabolism meaning the breaking down of larger molecules into smaller ones. The word glycolysis is derived from two Greek words and means the breakdown of something sweet. Glycolysis breaks down glucose and forms pyruvate with the production of two molecules of ATP. The pyruvate end product of glycolysis can be used in either anaerobic respiration if no oxygen is available or in aerobic respiration via the TCA cycle which yields much more usable energy for the cell.

So the correct option is 'glycolysis'.