Tag: life processes in living organisms- part 1

Quizzes (20) Questions (81)

Questions Related to life processes in living organisms- part 1

Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production

During fermentation what does not occurs ___________________.

  1. Oxidation of glucose into pyruvate

  2. Substrate level phosphorylation
  3. Oxidation of $NADH _2$

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

Answer is option D i.e. "Oxidative phosphorylation"
Fermentation occurs only when there is no oxidative phosphorylation to maintain the production of ATP by glycolysis. During fermentation, pyruvate is metabolized to various compounds such as lactic acid, ethanol and carbon dioxide or other acids. Also, fermentation reactions occur in the cytoplasm while oxidative phosphorylation occurs in mitochondria.

Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production

Fermentation is carried out by

  1. All bacteria

  2. All fungi

  3. Some bacteria and some fungi

  4. All micro-organisms
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fermentation is incomplete oxidation of food substances into alcohol and lactic acid with the small amount of energy being released. Both lactic acid and ethanol fermentation do not produce oxygen. It is carried out by anaerobic bacteria and fungi. Aerobic bacteria and fungi carry out aerobic respiration. Thus, the correct answer is option C.  

Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production

The product of fermentation is

  1. Ethanol and lactic acid

  2. Acetic acid and lactic acid

  3. Ethanol and acetic acid

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fermentation is a metabolic process in which an organism converts a carbohydrate, such as starch or a sugar, into an alcohol or an acid. For example, yeast perform fermentation to obtain energy by converting sugar into alcohol. Lactic acid fermentation takes place in muscles during heavy exercise producing lactic acid. The products of fermentation are acetic acid, lactic acid, ethanol etc.

Thus, the correct answer is option D. 

Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production

The energy releasing metabolic process in which substrate is oxidized without an external electron acceptor is called as

  1. Photorespiration

  2. Glycolysis

  3. Fermentation

  4. Aerobic respiration
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fermentation is incomplete oxidation of food substances in absence of oxygen (external electron acceptor) into alcohol or lactic acid with the small amount of energy being released. Aerobic respiration uses oxygen as an electron acceptor for oxidation of substrates. Glycolysis is the first common stage of both fermentation and aerobic respiration. Photorespiration is oxidation of RuBP by enzyme RUBISCO and does not produce energy. Thus, the correct answer is option C.

Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production

Fermentation is an

  1. Aerobic respiration

  2. Incomplete oxidation

  3. Excretory process

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The process of respiration can be aerobic or anaerobic. The process of anaerobic respiration is also called as fermentation. Fermentation is a form of anaerobic respiration in which carbohydrates are incompletely oxidised to either ethanol and carbon dioxide as in yeast or lactic acid, as in the muscles of higher vertebrates.

Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production

Who contributed to the research process on fermentation?

  1. Johannes Miller

  2. Matthias Jakob

  3. Robert Brown

  4. Schwann Theodor
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fermentation is the process pyruvate into lactic acid or alcohol in absence of oxygen. Schwann Theodor is considered as the founder of modern histology, the study of the structure of plant and animal tissues. Schwann discovered pepsin, the digestive enzyme, in the stomach epithelium, or membrane tissues, of animals. He also conducted valuable research on the processes of fermentation, purefaction, and muscular and arterial contraction. Therefore, the correct answer is option D.
Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production

The formation of NAD via anaerobic pathway takes place by

  1. Glycolysis.

  2. Fermentation.

  3. Krebs cycle.

  4. Electron transport chain.

  5. Photosynthesis.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In anaerobic conditions, glycolysis produces NADH. To continue glycolysis, NADH must be oxidized back to NAD+, which occurs during the fermentation process.