Cell biology and signalling

Question 1

Which one of these is an essential amino acid?
A. Threonine
B. Arginine
C. Tyrosine
D. Alanine

Answer 1

A.Threorine

Question 2

What kind of protein is sceptrin?

a. Integral
b. peripheral
c. anchored

Answer 2

B . Peripheral

Question 3

What is an isoenzyme?

a. Enzyme specific to the mitochondria
b. Enzyme without tissue specificity
c. Enzyme which can catalyze multiple reactions
d. Enzyme with different structure but identical specificity

Answer 3

D

Question 4

What kind of enzyme is chymotrypsin?

a. Transferase
b. protease
c. dehydrogenase
d. Kinase

Answer 4

B

Question 5

Which of these amino acids is not involved in the inter-organ transport of nitrogen?
a. Alanine
glutamate
c. Glutamine
d. Aspartate
e. Arginine

Answer 5

A

Question 6

The lower the pKa -

a. The stronger the acid
b. the weaker the acid

Answer 6

A

Question 7

Heamoglobin is a good blood buffer because it is rich in which amino acid?

a. Lysine
b. Histidine
c. Serine
d. Glycine

Answer 7

B

Question 8

Which of these is an aromatic amino acid?

a. Phenylalanine
b. Cysteine
c. arginine
d. Serine

Answer 8

A

Question 9

Which of these has the highest cholesterol composition?

a. Endoplasmic reticulum
b. Mitochondria
c. Golgi
d. Plasma membrane

Answer 9

D

Question 10

Which one of these is Not an essential amino acid?

a. Isoleucine
b. Valine
c. Histidine
d. Glutamine
e. Tyrosine

Answer 10

D

Question 11

At rest, PK is muck larger than what?

a. PNa
b. VM
c. ENa
d. EK

Answer 11

a

Question 12

Permeability of membranes t K+ is how many folds greater than to Na+?

a. 0.5
b. 5
c. 50
d. 500

Answer 12

c.50

Question 13

Hemoglobin’s affinity for oxygen increases as -

a. Carbon dioxide decreases and pH increases
b. Carbon dioxide decreases and pH decreases
c. Carbon dioxide increases and pH decreases
d. Carbon dioxide increases and pH increases

Answer 13

A

Question 14

Heamoglobin has how many times greater affinity to CO than O2?
A. 220
B.230
C.240
D.250

Answer 14

C

Question 15

What is the average diameter of a microtubules?

a. 25 micrometers
b. 25 nanometers
c. 25 picometers

Answer 15

b

Question 16

Which one of these statements applies only to beta sheets, not alpha sheets -

a. Extensive hydrogen bonds between carbonyl oxygen and the amine hydrogen of the peptide bond formed
b. It may be found in typical globular proteins
c. It is stabilized by interchange hydrogen bonds
d. It is an example of secondary structure

Answer 16

dont know