Match the structural properties of DNA with the respective types of DNA in which they are found.

COLUMN – I	COLUMN – II
A. Pitch per turn of helix	1. 45.6 angstrom 2. 24.6 angstrom 3. 33.2 angstrom
B. Helix packing diameter	1. 23.7 angstrom 2. 18.4 angstrom 3. 25.5 angstrom
C. Major-groove proportions	1. Flattened out on helix surface 2. Extremely narrow but very deep 3. Wide and of intermediate depth
D. Minor-groove proportions	1. Very broad but shallow 2. Extremely narrow but very deep 3. Narrow and of intermediate depth

#Question id: 11226

#Unit 7. System Physiology – Animal

At the neuromuscular junction, the neurotransmitter acetylcholine (ACh) is degraded by acetylcholinesterase. If a neurophysiologist applies the naturally occurring acetylcholinesterase inhibitor, onchidal (produced by the mollusc Onchidella binneyi), to a synapse, what would you expect to happen?

#Question id: 11227

#Unit 9. Evolution & Diversity of Life Forms

Mycoplasmas are bacteria that lack cell walls. Based on this structural feature, which statement concerning mycoplasmas should be true.

#Question id: 11228

#Unit 9. Evolution & Diversity of Life Forms

Though plants, fungi, and prokaryotes all have cell walls, we place them in different taxa. Which of these observations comes closest to explaining the basis for placing these organisms in different taxa, well before relevant data from molecular systematics became available?

#Question id: 11229

#Unit 9. Evolution & Diversity of Life Forms

Which is the bacterial structure that acts as a selective barrier, allowing nutrients to enter the cell and wastes to leave the cell.

#Question id: 11230

#Unit 9. Evolution & Diversity of Life Forms

Which statement about bacterial cell walls is false?

#Question id: 11231

#Unit 9. Evolution & Diversity of Life Forms

Which of these is the most common compound in the cell walls of gram-positive bacteria?