Question

29. COPI- coated vesicles transport ER-resident enzymes from rhe cisGolgi to the ER

a. true

b. false

30. which of the following is NOT a funtion of motor proteins associated with the cytoskeleton?

a. transporting single molecules such as glucose directly from the membrane region to mitochondria

b. seperating a cell in two during cytokinesis

c. moving growth factor containing vesicles from a nerve terminal go the cell body of a developing neuron.

d. movement kg lysosomal vesicles

e. localization of organelles such as the Golgi

Answer 1

29. The statement is TRUE

Explanation: COPI coated vesicle is used to transport proteins from cis end of Golgi bodies back to rough endoplasmic reticulum.

30. Correct answer is option a -  transporting single molecules such as glucose directly from the membrane region to mitochondria

Explanation: Cell membrane do not allow simple diffusion for entering of glucose. Glucose is transported through plasma membrane by the process of facilitated diffusion from higher concentration to lower concentration without any role of motor proteins. Glucose transporter are located in the plasma membrane which helps entry of glucose into the cells. The carrier proteins bind to glucose, which causes conformational change in shape and thi facilitates translocation of glucose from one side of the membrane to the other.