Biology

Question 1

Cause of action potentials

Answer 1

The massive influx of sodium through voltage gated ion channels causes the depolarization of the neuron; action potentials result in increased permeability of the plasma membrane to sodium

Question 2

How many ATP molecules does glycolysis produce

Answer 2

2 ATP per glucose molecule. 3 Na+ molecules are extruded for each ATP utilized by the sodium pump, total of 6 molecules of Na+ are extruded per molecule of glucose

Question 3

Under normal conditions where is hemoglobin found?

Answer 3

In RBC & is not found in the plasma. Plasma hemoglobin is an operational measure of the extent of hemolysis (rupture of RBC)

Question 4

Which bacterial process utilizes Factor F plasmid?

Answer 4

Conjugation; it’s fertility factor

Question 5

Transformation

Answer 5

Bacteria take up DNA from their surroundings, the media in which they are immersed

Question 6

Transduction

Answer 6

The process whereby genes are transferred to a bacteria by a virus

Question 7

What kind of action inflates lungs in mammals?

Answer 7

Positive pressure pumping action. Because the lung stays in contact with the thoracic wall as it enlarges due to contraction of the diaaphragm & the external intercostal muscles, a presssure that is lower than atmospheric pressure (negative presssure) is generated w/in the alveolar sacs