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39.
Where are gap junctions found?
Between nerve cells
In plasma membranes of apposed cells
In the synaptic cleft.
All of the above.
None of the above.
40.
Which is the correct order of increasing bond energies?
hydrogen bonds, covalent bonds, van der Waals interactions
hydrogen bonds, electrostatic interactions, covalent bonds
van der Waals interactions, covalent bonds, hydrogen bonds
covalent bonds, hydrogen bonds, van der Waals interactions
hydrophobic interactions, hydrogen bonds, electrostatic interactions
41.
Multidrug resistance in tumor cells is
due to the action of a membrane pump which transports small molecules out of the cells.
the development of resistance to several drugs following an initial resistance to a single drug.
caused by a mutation in the cystic fibrosis gene.
A and B
All of the above
42.
What is the function of a thioester intermediate such as the one formed from GAP?
It speeds up the actual reaction so that more product can be made.
The thioester shifts the equilibrium of the first stage of the reaction.
The thioester allows the two-step reaction to be coupled so the second reaction, the energetically unfavorable phosphorylation, can proceed.
The thioester intermediate induces a conformational change that alters the enzyme specificity.
The thioester prevents the formation of metabolically unfavorable side products.
44.
Which of the following are proteins that bind to specific carbohydrate structures in order to facilitate recognition between proteins and cells?
glycoproteins
lectins
mucoproteins
glycosaminoglycans
proteoglycans
Between nerve cells
In plasma membranes of apposed cells
In the synaptic cleft.
All of the above.
None of the above.
Explanation / Answer
39.between nerve cells
40.covalent bonds,h Hydrogen bonding , Vanderwaals interaction
41.a and B-
42.the thioester prevents the formation of metabolically unfavourable side products.
43.glycoproteins
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