Kerala PSC Previous Years Question Paper & Answer

Title : ASSISTANT RESEARCH OFFICER CHEMISTRY
Question Code : A

Page:8


Below are the scanned copy of Kerala Public Service Commission (KPSC) Question Paper with answer keys of Exam Name 'ASSISTANT RESEARCH OFFICER CHEMISTRY' And exam conducted in the year 2018. And Question paper code was '068/2018/OL'. Medium of question paper was in Malayalam or English . Booklet Alphacode was 'A'. Answer keys are given at the bottom, but we suggest you to try answering the questions yourself and compare the key along wih to check your performance. Because we would like you to do and practice by yourself.

page: 8 out of 12
Excerpt of Question Code: 068/2018/OL

D:-Cytosol, mitochondria and endoplasmic reticulum

Correct Answer:- Option-D
Question64:-Thymidylate synthase catalyse the conversion of dUMP to dTMP, which of the following donate the methyl
group?

A:-Methyl THF

B:-Methylene THF

C:-Formyl THF

D:-SAM

Correct Answer:- Option-B
Question65:-Suppose the number of carbon rings in an *"F_O/F_1"* ATP synthase is 12. Then the value of P/O ratio for NADH,
“"H*+'" and *"FADH_2"’ respectively are

A:-2 and 1.2

B:-2.5 and 1.5

C:-3 and 2

D:-1.5 and 2.5

Correct Answer:- Option-A
Question66:-Beta oxidation of a 20C saturated fatty acid to ‘"CO_2"° generate which of the following number of reductants?

A:-8 NADH, *"H*+"* and 8 ` "74011 2"7

B:-9 NADH, *"H*+"* and 9 2൧൧൧27"

C:-10 NADH, *"H*+"* and 10 *"FADH_2"°

D:-7 NADH, *"H*+"* and 7 ` "74011 2"

Correct Answer:- Option-B
Question67:-Mixed inhibition and non-competitive inhibition are of two types of reversible inhibition. Which of the following
is correct related to these inhibitions?

A:-In both mixed inhibition and non-competitive inhibition *"V_m_a_x"’ decreases and Km increases

B:-In mixed inhibition *"V_m_a_x"’ decreases and Km increases, in non-competitive inhibition ‘"V_m_a_x"’ decreases
and Km unchanged

C:-In both mixed inhibition and non-competitive inhibition ‘"V_m_a_x'" and Km decreases

D:-In mixed inhibition ‘"V_m_a_x"’ decreases and Km decreases, in non-competitive inhibition ‘"V_m_a_x"’ decreases
and Km increases

Correct Answer:- Option-B
Question68:-Which of the following RNA molecule is NOT a ribozyme?

A:-28S rRNA

B:-5S rRNA

C:-RNA part of RNase P

D:-Hammer head RNA

Correct Answer:- Option-B
Question69:-Carbonic anhydrase enzyme catalyse the production of carbonic acid from water and *"CO_2"* . Which of the
following is correct related to this enzyme?

A:-Carbonic anhydrase decreases the *"pK_a"* value of water

B:-Carbonic anhydrase increases the *"pK_a"’ value of water

C:-""K*+"" is the cofactor of carbonic anhydrase

D:-"Ca*2*+"" is the cofactor of carbonic anhydrase

Correct Answer:- Option-A
Question70:-Which of the following is the ratio of phospholipid : sphingomyelin : cholesterol in a normal eukaryotic cell
plasma membrane?

൧:-1:1:1

B:-1.5:0.5:1

C:-0.5:1.5:1

D:-1:0.5:1.5

Correct Answer:- Option-B
Question71:-The absorption of ultraviolet (UV) light (the absorbance at 280 nm) is often used as a measure of protein
concentration. The R-groups of which amino acids contribute most to absorption of 280 nm light?

A:-Ser, Thr, Cys

B:-Lys, Arg, His

C:-Trp, Tyr, Phe

D:-Ser, Ala, Glu

Correct Answer:- Option-C
Question72:-In a eukaryotic cell plasma membrane, different phospholipid preferentially localized to either cytosolic side or
exoplasmic side. Which of the following is the correct orientation of phospholipids like phosphatidyl! choline and phosphatidyl!
inositol in cytosolic and exoplasmic side?

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