Question

The role of Voltage Sensitive Na⁺ Channels (VSSC in neuron signaling) is:             

a) Initiation of depolarization   

b) propagation of depolarization       

c) space from an axonal membrane of a neuron to dendrite membrane of next neuron                

d) release of neurotransmitter

ATP production during aerobic respiration is by which mechanism:       

a) substrate level phosphorylation   

b) oxidative-phosphorylation  

c) both substrate-level and oxidative-phosphorylation  

d) This depends upon the temperature

e) this depends upon the pH

ATP production during glycolysis is by which mechanism:

a) substrate-level phosphorylation   

b) oxidative-phosphorylation  

c) both substrate-level  and oxidative-phosphorylation  

d) this depends upon the temperature

e) this depends upon the pH

Which is not a postulate of cell theory:

a) all life is made of cells

b) heredity is controlled by genes

c) all cells come from pre-existing cells   

d) all cells are microscopic  

If a molecule has a molecular weight (mw) of 3,685 daltons (Da), then how many grams are required to make 1.0 mole:

a)  3,685 g   

b) 368.5 g   

c) 36.85 g    

d) 3.7 g

Answer 1

answer1 - The role of the voltage sensitive na+ channels -

a)Initiation of the depolarization

explanation: voltage gated na+ channels initiates and propagates the action potential in the neurons and other excitable cells.their important role in the neuronal excitability .in response to the sodium channels open at the beginning of the action potential and the na+ moves into the axon, causing the depolarization. We should remember that sodium has a positive charge ,so the neurons becomes more positive and becomes depolarized.it takes a long tyme to take the potassium channel to open up and reversing the depolarization.

Answer2) ATP production during the aerobic respiration is by which mechanisms-

b)oxidative phosphorylation

explanation: ATP production during the aerobic respiration is by oxidative phosphorylation metabolic pathway . This generally works by the energy realized in the consumption of the pyruvate being used.during this cellular respiration, the glucose molecule is gradually broken down into the co2 and water.more ATP is produced later and are called as the oxidative phosphorylation.

answer3)ATP production during the glycolysis is by which method

A)substrate level phosphorylation

explanation: here, glycolysis is used by all the cells in the body for the energy generation. Glycolysis is a partial breakdown of a six carbon glucose molecule into 2,3 carbon molecules as the result of the substrate level phosphorylation. Here , the final product of the glycolysis is the pyruvate in the aerobic settings and that of the lactate in the anaerobic condition.

answer4)which is a not a postulate of the cell theory-

all cells are microscopic

Explanation: the postulates of the cell theory are as follows-

1)all living being are made up of cells

2)the cell is a structural and the functional unit of life

3)all living beings develop from a pre existing cell.

The cell is regarded as the structural and fundamental unit of life, hereditary information is passed from cell to cell.