Tag: bio-chemistry

Quizzes (82) Questions (1918)

Questions Related to bio-chemistry

Multiple choice bio-chemistry biological oxidation chemiosmotic hypothesis living organisms and energy production mechanism of photosynthesis

Read the following statements : 
a) $F _0$ part of ATPase is associated with breakdown of proton gradient.
b) A H - carrier contributes in creation of proton gradient.
c) Movement of electrons in ETS is coupled to pumping of protons into the lumen.
d) Formation of $NADPH + H^+$ is related with the creation of proton gradient.
How many of the above statements are correct ?

  1. Two

  2. One

  3. Four

  4. Three
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice bio-chemistry biological oxidation chemiosmotic hypothesis living organisms and energy production mechanism of photosynthesis

Centrioles, cilia, flagella, and basal bodies have remarkably similar structural elements and arrangements. This leads us to which of the following as a probable hypothesis ?

  1. Disruption of one of these types of structure should necessarily disrupt each of the others as well.

  2. Loss of basal bodies should lead to loss of all cilia, flagella and centrioles

  3. Motor proteins such as dynein must have evolved before any of these four kinds of structure.

  4. Natural selection for motility must select for microtubular arrays in circular patterns.
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Multiple choice bio-chemistry biological oxidation chemiosmotic hypothesis living organisms and energy production mechanism of photosynthesis

Which of the following is not required for chemiosmotic process?

  1. Proton gradient

  2. Spliting of water

  3. ATP synthase enzyme

  4. Closed membrane system
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A. Proton gradient is required because the breakdown of this gradient leads to release of energy.
B. Splitting of water is required which takes place on the inner side of the membrane and the protons that are produced, they accumulate within the lumen of the thyllakoids.
C. ATP synthase enzyme is required that allows diffusion of protons back across the membrane, this releases energy to activate ATPase enzyme which catalyses the formation of ATP.
D. Closed membrane system is not required. Only a membrane is required for the development of a proton gradient across the membrane of the thyllakoid and the proton accumulation is towards the inside of the membrane.
So, the correct answer is 'Closed membrane system'.
Multiple choice bio-chemistry biological oxidation chemiosmotic hypothesis living organisms and energy production mechanism of photosynthesis

How many ATP molecule could maximally be generated from one molecule of glucose, if the complete oxidation of one mole of glucose to $CO _{2}$ and $H _{2}O$ yields $686$ kcal and useful chemical energy available in the high energy phosphate bond of one mole of ATP is $12\ kcal$.

  1. Fifty-seven

  2. One

  3. Two

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

Using the same calculation as before: 686 kcal / 12 kcal/ATP = 57.16. The maximal number of ATP is 57.

Multiple choice bio-chemistry proteins muscle tissue structure of protein muscle tissues

An example of structural protein is

  1. Myosin

  2. Collagen

  3. Keratin

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

Structural proteins are fibrous proteins and form the largest class of proteins measured in terms of their total mass. Structural proteins include myosin, collagen, and keratin. 

Keratins form the protective covering like skin, hair, fur, wool, etc. in all land vertebrates. Equally widespread are the actin and myosin proteins of muscle tissue that play a major role in body movements. In addition, there are the collagens of tendons and hides, which form connective ligaments within the body.
Thus, the correct answer is option (D), 'All of the above'.

Multiple choice bio-chemistry immunity and blood groups blood group blood groups and compatibility advance blood groups and transfusion compatibility of blood groups

Which of the following cells play an important role in failure of transplanted organ?

  1. $CD _4$ cells and $CD _8$ cells

  2. Natural killer cells

  3. Plasma cells

  4. Mast cells
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Transplant rejection is primarily a cell-mediated response. CD4+ (helper) and CD8+ (cytotoxic) T-cells recognize foreign MHC antigens on the donor organ and initiate the destruction of the graft tissue.

Multiple choice bio-chemistry immunity and blood groups blood group blood groups and compatibility advance blood groups and transfusion compatibility of blood groups

Antibody common to blood group $O^-$ and individual with blood group $B^+$ is /are 

  1. Anti -B

  2. Anti A

  3. Both Anti B and Anti A

  4. Anti -RH
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An individual with blood group O negative lacks A, B, and Rh antigens, meaning their plasma contains anti-A, anti-B, and potentially anti-Rh antibodies. A person with blood group B positive has B antigens on their red blood cells and therefore possesses anti-A antibodies in their plasma.

Multiple choice bio-chemistry immunity and blood groups blood group blood groups and compatibility advance blood groups and transfusion compatibility of blood groups

Persons with blood group A possess

  1. Antigen A and antibodies b

  2. Antigen A and antibodies a

  3. No antigen but antibodies a and b

  4. Antigens A and B but no antibodies.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Individuals with blood group A have antigen A on the surface of their red blood cells and anti-B antibodies (often denoted as b) in their plasma.