Specific proteins responsible for the flow of materials and information into the cell are called
membrane receptors
carrier proteins
integral proteins
none of these
B.
carrier proteins
Active transport is the uphill movement of materials across the membrane where the solute particles move against their concentration gradient or electro- chemical gradient. It takes place through special organic molecules called carrier molecules or carrier particles or carrier proteins. For each solute particle, there is a special carrier molecule. It has its own binding site on the two surfaces of the membrane. Substrate combines with the carrier to form carrier solute complex. It further undergoes a conformational changes and is transported to other side of the membrane. ATP provides energy to the carrier.
Assertion : Connective tissue inside the brain is essential for conduction of nerve impulse.
Reason : Connective tissue hold together the nerve cells of brain.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion: Cytokinins increases shelf life of fruits and vegetables.
Reason : Cytokinins induce cell division.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion : Angina pectoris means "pain in the chest".
Reason : It results due to carrying of extra blood to the heart muscle.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion : Glycolysis is the first step of respiration in which glucose completely breaks into CO2 and H2O.
Reason : In this process, there is net gain of twenty four molecules of ATP.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion : Excess of nitrates in drinking water are harmful for infants.
Reason : Nitrates are responsible for blue baby syndrome.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion : Nucleus is the controlling centre of a cell.
Reason : Pores in the nuclear envelop regulate the flow of materials in and out of the nucleus.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion : Hormone calcitonin has antagonistic effect to that of parathormone.
Reason : Calcitonin decreases blood calcium level while parathormone increases blood calcium level.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion : Dark reaction occurs only at night in the stroma of chloroplast.
Reason : CO2 fixation occurs only during C3 cycle.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
