Sodium ions are “pumped” from a region of lower concentration to a region of higher concentration in the nerve cells of humans. This process is an example of

Related Mcqs:

1. The movement of water molecules from a region of higher water potential to a region of lower water potential (through membrane)

   A. Deffusion
   B. Osmosis
   C. Active transport
   D. None of these

2. Which of the following ions are involved in the initiation of nerve impulse_______________?

   A. Na+
   B. K+
   C. Fe
   D. none of these

3. It is stiff rod of special cells surrounded by connecive tissue present in the mid -dorsal region and appears in the embryos of all chordates

   A. Placenta
   B. Notochord
   C. Cranianta
   D. Ligule

4. If the concentration of enzyme is kept constant and amount of substrate is increased a point is reached where increase in substrates concentration does not affect the reaction rate because of____________________?

   A. Enzymes get denatured at higher substrate conc
   B. Rate of reaction is indirectly proportional to substrate concentration at this point
   C. All the active sites on enzyme molecule are occupied
   D. None of these

5. Transport of minerals from soil to epidermal cells of roots via carrier protein molcules along their concentration gradient is called___________?

   A. Diffusion.
   B. Facilitated diffusion.
   C. Passive transport.
   D. Active transport.

6. If the number of chromosomes in most body cells of a mammal is 40, the cells in the seminiferous tubule will have___________?

   A. 40 chromosomes
   B. 20 chromosomes
   C. 10 chromosomes
   D. While some other will have 20

   Submitted by: Rashid Mehmood

7. There are cells in human body called Faggot cells which cause__________?

   A. AIDS
   B. Tuberculosis
   C. Smallpox
   D. Leukaemia

   Submitted by: Ali Mallah

8. Cell membrane under resting conditions is impermeable to all the ions except_____________?

   A. Na+
   B. K+
   C. Cl-
   D. PO4-2

9. The diffusion of ions along with water also takes place by mass flow system along the ________ path?

   A. Tonoplast
   B. Apoplast
   C. Symplast
   D. Vacuolar

10. In humans the number of tetrads formed during mitosis is___________?

    A. 23
    B. 46
    C. 0
    D. 4