Question

QUESTION 34

1. Microtubules are ____________________.

   		assembled from subunits that are arranged in alternating directions
   		formed by assembly of protofilaments followed by bundling of these filaments into hollow cylinders
   		responsible for the formation of protruding microvilli in the plasma membranes of absorptive cells
   		relatively rigid and resist compressive forces

QUESTION 35

1. Match each feature of a cilium or flagellum to the correct term. Some terms will not be used.

   -       A.       B.       C.       D.       E.       F.       G.       H.	Organizer of a flagellum
   -       A.       B.       C.       D.       E.       F.       G.       H.	Motor protein of a cilium
   -       A.       B.       C.       D.       E.       F.       G.       H.	Energy source for movement of cilia
   -       A.       B.       C.       D.       E.       F.       G.       H.	Length of a flagellum relative to cell body

   A.	GTP
   B.	Centrosome
   C.	Basal body
   D.	Longer
   E.	Shorter
   F.	ATP
   G.	Kinesin
   H.	Dynein

QUESTION 36

1. The diffusible gaseous signaling molecule nitric oxide (NO) _______________.

   a		binds to an integral membrane receptor protein on the surfaces of cells
   b		binds to an intracellular receptor which then activates the enzyme guanylyl cyclase
   c		directly activates the intracellular enzyme guanylyl cyclase without involving a receptor
   d		activates an intracellular kinase which then phosphorylates guanylyl cyclase

Answer 1

Question 34)

Microtubules are formed by assembly of protofilaments followed by the bundling of these filaments into a hollow cylinder.

Question 35)

A) Organizer of a flagellum - basal body

B) Motor protein of cilia - Dynein

C) Energy source for movement of cilia - ATP

D) Length of a flagellum relative to cell body - Longer

Question 36)

The diffusible gaseous signalling molecules nitric oxide,

Binds to an intracellular receptor which then activates the enzyme guanylyl cyclase