Download App

Biomolecules — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryBiomolecules2 Marks
Question
Why B complex vitamine compounds are essential for us? Describe their important sources.
✓

Answer

→Deficiency of vitamin B1 (thiamine) leads to the disease like Beriberi (loss of appetite, retarded growth). So, it is essential for us. Important sources are yeast, milk, green vegetables and cereals. etc....
→Deficiency of vitamin B2 (Riboflavin) leads to the cheilosis (fissuring at corners of mouth and lips), digestive disorders and burning sensation of the skin, so it is essential for us. Important sources are milk, egg white, liver and kidney.
→Deficiency of vitamin B6(Pyridoxine) leads to convulsions so it is essential for us. Important sources are yeast, milk, egg yolk, cereals and grams
→Deficiency of vitamin B12 leads to pernicious anaemia (RBC deficient in haemoglobin), so it is essential for us. Important sources are meat, fish, egg and curd.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from Biomolecules→Biomolecules — all question types→Chemistry STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Explain production of phenol from Cumene.
→
Explain the nomenclature of Enzymes.
→
Complete the following equations :
(i) $CH _3- CH _2- Cl \xrightarrow{+ A } B \xrightarrow{ C } CH _3- CH _2- NH _2+ HCOOH$
(ii) $CH _3- I \xrightarrow{+ A } B \xrightarrow{ C } CH _3- NH - CH _3$
→
The conductivity of 0.001 M C$H _3$COOH is $4.9 \times 10^{-5} S cm { }^{-1}$, calculate degree of dissociation of $CH _3 COOH$ if $\grave{\Lambda}_m$ for $CH _3 COOH$ is $390.5  S cm ^2 mol^{-1}$.
→
Explain the following behaviours:
  1. -OH group attached to a carbon of benzene ring activates it towards electrophilic substitution.
  2. Reactivity of all the three classes of alcohols with conc. HCl and ZnCl2 is different.
  3. Anisole reacts with HI to give phenol and methyl iodide and not iodobenzene and methyl alcohol.
→
The following results have been obtained during the kinetic studies of the reaction:

2A + B → C + D

Experiment [A]/mol L-1 [B]/mol L-1

Initial rate of formation of

D/mol L-1 min-1
I 0.1 0.1 6.0 × 10-3
II 0.3 0.2 7.2 × 10-2
III 0.3 0.4 2.88 × 10-1
IV 0.4 0.1 2.40 × 10-2
Determine the rate law and the rate constant for the reaction.

→
What do you understand by lanthanoid contraction?
→
Determine the values of equilibrium constant (KC) and $\Delta$Go for the following reaction:
$\text{Ni (s)}+\text{2Ag}^{+}\text{(aq)}\rightarrow\text{Ni}^{2+}+\text{2Ag(s)},\text{E}^{o}=1.05\text{V}\ \ \ (\text{IF} = 96500 \text{C mol}^{–1}).$
→
Calculate the mole fraction of gas $A$ is the soltuion made an mixing 0.5 moles of gas $A$ and 4.5 moles of gas B.
→
Explain the property of optical activity of an amino acids.
→