Question

these 5 statements are right or wrong? thanks

A coding region of an mRNA with 102 nucleotides long, including both start and stop codons encodes a protein consisting of a total of 33 amino acid residues after translation.

In an acidic environment, the oxygen dissociation curve of adult haemoglobin would change from sigmoidal to hyperbolic shape.

The distal histidine stabilises the iron in the heme group when oxygen is not bound to haemoglobin.

Inhibitory neurotransmitters can generate a more negative membrane potential.

Dephosphorylation decreases the activity of all proteins

Answer 1

Question

Answer:

(1) True.

In protein translation 3 bp gives a code for an amino acid. But stop codon can’t code of any amino acid. So total amino acid will be (102-3(stop codon))/3= 33

(2) False

In acidic environment, curve will have right shift which make it more sigmoidal.

(3) True

In presence of oxygen, histidine will change the conformation of haemoglobin and increase the affinity toward O2. But in absent of oxygen, it will stabilize the iron.    

(4) True

Inhibitory neurotransmitters generate more negative membrane potential to stop activity.

(5) False

Dephosphorylation is process of removing phosphate group. It can activate or deactivate the protein.