What is anabolism ?

Choose the correct answer from the options given below:

Which of the following are the necessary conditions for the growth of coral reefs ?

1. Photic conditions

2. Clean and sediment free water

3. Sea salinity of 6%

4. Tropical sea water with temperature of 20°C to 21°C

For the Amphibolic pathway, choose the correct option of true assertions from the given assertions. 

(I) Lipid enters the first stage of the respiratory pathway.

(II) The conversion of carbohydrates into glucose, before their entry into respiration is not compulsory.

(III) Protein enters into the respiratory pathway in the form of Pyruvic acid.

(IV) Oxidation and formation of lipid and protein, these two events take place.

Find out where transketolase and epimerase reactions occur among the following:

i) $\mathrm{G}-3-\mathrm{P}+\mathrm{DHAP}⟶$ Fructose $-1-6-$ bisphosphate

ii) Sedoheptulose- $7-$ Phosphate $+\mathrm{G}-3-\mathrm{P}⟶$ Xylulose $-5-\mathrm{P}+$ Ribose $-5-$ Phosphate

iii) Ribose $-5-$ Phosphate $⟶$Ribulose $-5-$ Phosphate

iv) Xylulose $-5 -$Phosphate $⟶$ Ribulose$-5 -$ Phosphate

v) Fructose $- 6 -$Phosphate $+\mathrm{G}-3-\mathrm{P}⟶$ Xylulose$- 5 -$Phosphate $+$ Erythrose $-4-$Phosphate

The correct combination is

Four mutant strains of bacteria $(1-4)$ all require substance $S$ to grow (each strain is blocked at one step in the $S-$biosynthesis pathway). Four plates were prepared with minimal medium and a trace of substance $S,$ to allow a small amount of growth of mutant cells. On plate $A$, mutant cells of strain $1$ were spread over entire surface of the agar to form a thin lawn of bacteria. On plate $B$, the lawn was composed of mutant cells of strain $2,$ and so
on. On each plate, cells of each of the four mutant types were inoculated over the lawn, as indicated in the figure by the circles. Dark circles indicate excellent growth. A strain blocked at a later step in the $S$ substance metabolic pathway accumulates intermediates that can 'feed' a strain blocked at an earlier step.

What is the order of genes $(1-4)$ in the metabolic pathway for synthesis of substance $S ?$