Tag: biology

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Multiple choice biology meaning of life chemical organization in living beings lipids proteins and their structure

Lipids are insoluble in water because they are

  1. Neutral

  2. Zwitter ions

  3. Hydrophobic

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

Lipids are hydrophobic means water hating. They are water insoluble. Lipids are non-polar molecules while water is polar molecule, so there is no way for water to attach to a lipid molecule. Instead, the non-polar lipids will bind to themselves, which is why oils and fats form droplets on the surface of water.

Multiple choice biology meaning of life chemical organization in living beings lipids proteins and their structure

Membrane phospholipids are

  1. Amphipathic

  2. Amphibolic

  3. Hydrophobic

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

Membrane phospholipids are amphipathic having a polar head made of phosphate residue and a non-polar lipid tail. The polar phosphate head is exposed on the surface while non-polar lipids are embedded within the interior of membrane.

Multiple choice biology the respiratory system anaerobic respiration in organisms anaerobic and aerobic respiration cellular respiration

When you add yeast to dough, it rises because

  1. Yeast cells reproduce by budding

  2. Budding yeast cells form colonies

  3. Of the bulk of the new yeast cells

  4. The rapidly reproducing yeast cells release carbon dioxide due to anaerobic respiration
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • The yeast changes the sugar in the dough into carbon dioxide gas and ethanol (alcohol).
  •  The gas, trapped in the dough, makes it rise; the alcohol produced during fermentation evaporates during baking. Hence, When you add yeast to the dough, it rises because the rapidly reproducing yeast cells release carbon dioxide due to anaerobic respiration.
So, the correct answer is 'The rapidly reproducing yeast cells release carbon dioxide due to anaerobic respiration'.

Multiple choice biology the respiratory system anaerobic respiration in organisms anaerobic and aerobic respiration cellular respiration

When you add yeast to dough, it rises because

  1. Yeast cells reproduce by budding.

  2. Budding yeast cells form colonies.

  3. The rapidly reproducing yeast cells release carbon dioxide due to anaerobic respiration.

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

Yeast are the organism that executes the process of fermentation in which they break down the sugar into its simpler forms for obtaining energy. In this process carbon dioxide and alcohol are also forms and CO$ _2$ helps the dough to rise. The process is favorable in humid and warm conditions in colder environment it slows down.

So, the correct answer is 'The rapidly reproducing yeast cells release carbon dioxide due to anaerobic respiration'.

Multiple choice biology the respiratory system anaerobic respiration in organisms anaerobic and aerobic respiration cellular respiration

Which substance is produced in anaerobic respiration by an organism but not in aerobic respiration?

  1. Carbon dioxide

  2. Water

  3. Ethanol

  4. Acetic acid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fermentation is a form of anaerobic respiration in which alcohol is formed by the breakdown of glucose in the absence of oxygen. It usually done by the yeast. In alcoholic fermentation, pyruvic acid is converted into ethanol with the liberation of carbon dioxide. The alcoholic fermentation equation is as follows: 
C$ _6$H$ _{12}$O$ _6$ + 2 ADP + P --> 2 C$ _2$H$ _5$OH + 2 CO$ _2$ + 2 ATP

Therefore, the correct answer is option C.

Multiple choice biology the respiratory system anaerobic respiration in organisms anaerobic and aerobic respiration cellular respiration

The end product of anaerobic respiration, in plants, is

  1. Pyruvic acid

  2. Malic acid

  3. Ethyl alcohol

  4. Methyl alcohol
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Anaerobic respiration refers to the type of respiration that takes place without oxygen. In plants, the glucose is anaerobically converted to ethyl alcohol, ATP and carbon dioxide.

Therefore, the correct answer is option C.

Multiple choice biology the respiratory system anaerobic respiration in organisms anaerobic and aerobic respiration cellular respiration

Lack of oxygen in muscles often leads to cramps among cricketers.
This results due to

  1. Conversion of pyruvate to ethanol

  2. Conversion of pyruvate to glucose

  3. Non conversion of glucose to pyruvate

  4. Conversion of pyruvate to lactic acid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Intracellular acidosis occurs due to lactic acid accumulation, it has been regarded as the most important cause of skeletal muscle fatigue. Lactic acid is formed and accumulated in the muscle under conditions of high energy demand, rapid fluctuations of the energy requirement and insufficient supply of oxygen. Subsequently, the pyruvate synthesised during glycolysis is converted to lactic acid in anaerobic condition. Thus, the correct answer is option D.

Multiple choice biology the respiratory system anaerobic respiration in organisms anaerobic and aerobic respiration cellular respiration

Which of the following statement(s) is (are) correct?
(i) Pyruvate can be converted into ethanol and carbon dioxide by yeast.
(ii) Fermentation takes place in aerobic bacteria.
(iii) Fermentation takes place in mitochondria.
(iv) Fermentation is a form of anaerobic respiration.

  1. (i) and (iii)

  2. (ii) and (iv)

  3. (i) and (iv)

  4. (ii) and (iii)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fermentation is an anaerobic process which takes place in the absence of oxygen that converts sugar to acids or alcohol. It occurs in yeast, bacteria, and also in oxygen-starved muscle cells, as in the case of lactic acid fermentation. 

So, the correct answer is option C.

Multiple choice biology the respiratory system anaerobic respiration in organisms anaerobic and aerobic respiration cellular respiration

State whether the following statements are true or false.
Facultative anaerobes may live with or without oxygen.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Facultative anaerobes are organisms which can switch over to the anaerobic mode of respiration when needed they can also grow in absence of oxygen. 

So, the correct option is 'True'.

Multiple choice biology the respiratory system anaerobic respiration in organisms anaerobic and aerobic respiration cellular respiration

The muscle fatigue occurs due to the accumulation of

  1. lactic acid

  2. glycogen

  3. creatine phosphate

  4. carbon dioxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Long-term muscle use requires the delivery of oxygen and glucose to the muscle fibre to allow aerobic respiration to occur, producing the ATP required for muscle contraction. If the respiratory or circulatory system cannot keep up with demand, then energy will be generated by the much less efficient anaerobic respiration.
In aerobic respiration, pyruvate produced by glycolysis is converted into additional ATP molecules in the mitochondria via the Krebs Cycle. With insufficient oxygen, pyruvate cannot enter the Krebs cycle and instead accumulates in the muscle fibre. Pyruvate is continually processed into lactic acid. With pyruvate accumulation, lactic acid production is also increased. This lactic acid accumulation in the muscle tissue reduces the pH, making it more acidic and producing the stinging feeling in muscles and induces fatigue.
So, the correct option is 'lactic acid'.