Biology Test 259

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Biology Test 259

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following is the correct sequence in Krebs’ cycle?

A

B

C

D

Solution
Question 2
4 / -1

RQ (Respiratory Quotient) is the ratio of which gases during the respiration?

A

B

C

D

Solution
Question 3
4 / -1

Which among the following statements is/are correct regarding nitrogenase enzyme?

A
The enzyme is exclusive to prokaryotes.

B
It gets inactivated when exposed to molecular oxygen.

C
It is present within the bacteroids.

D
All of the above

Solution

Nitrogenase enzyme is important for nitrogen-fixation. It is found in prokaryotes. It is present within the bacteroids. It is very sensitive to O2 and gets inactivated when exposed to molecular oxygen.
Question 4
4 / -1

Which element helps in the activation of enzymes of both photosynthesis and respiration?

A
Calcium

B
Magnesium

C
Potassium

D
Phosphorus

Solution

Magnesium helps in the activation of enzymes of both photosynthesis and respiration.
Question 5
4 / -1

Directions For Questions

Pasteur effect is

I. Rate of fermentation is higher under anaerobic conditions.

II. Rate of fermentation is lower under anaerobic conditions.

III. It involves anaerobic breakdown of sugar into CO2 and ethyl alcohol.

IV. It was confirmed by Meyerhoff and Warburg.

...view full instructions

Choose the correct option containing true statements.

A
I and II

B
I and III

C
I, III and IV

D
I and IV

Solution

The Pasteur effect is an inhibiting effect of O₂ on the fermentation process. It involves anaerobic breakdown of sugar in CO₂ and ethyl alcohol. This effect was confirmed by Meyerhoff and Warburg.
Question 6
4 / -1

Photosynthesis consists of essentially two biological reactions, one followed by the other, the second of these reactions involves which of the following events given in the options?

A
Fixation of CO₂

B
Synthesis of starch

C
Trapping of light energy

D
All of these

Solution

Photosynthesis occurs in two phases, i.e. photochemical and biosynthetic. The function of photochemical phase is to produce assimilatory power. Biosynthetic phase catalyses assimilation of CO₂ to carbohydrates.
Question 7
4 / -1

Which of the following cells secrete histamine, serotonin, etc., and are involved in inflammatory reactions?

A
Monocytes

B
Neutrophils

C
Basophils

D
Lymphocytes

Solution

Basophils are the cells that secrete histamine, serotonin, etc. These cells are involved in inflammatory reactions.
Question 8
4 / -1

Which of the following valves does not allow the passage of blood in the right auricle?

A
Haversian valve

B
Eustachian valve

C
Thebesian valve

D
Semilunar valve

Solution

The opening of inferior vena cava is guarded by Eustachian valve while the opening of superior vena cava is guarded by Haversian valve. The opening of the coronary sinus has coronary or Thebesian valve. These valves allow the passage of blood in the right auricle. Semilunar valves are located at the base of pulmonary trunk and aorta.
Question 9
4 / -1

In the process of haemodialysis, the blood of the patient that is pumped into the haemodialyser is taken from

A
arteries

B
veins

C
interstitial fluid

D
either arteries or veins

Solution

In the process of haemodialysis, the blood of the patient that is pumped into the haemodialyser is taken from radial artery.
Question 10
4 / -1

Nutrients absorbed by the intestinal villi go into the liver through

A
aorta

B
posterior vena cava

C
hepatic artery

D
hepatic portal vein

Solution

Nutrients absorbed by the intestinal villi go into the liver through hepatic portal vein.