The colored pigments of plants are of two principal types: carotenoids and flavonoids. Given below some statements of about these pigments;

 a) Anthocyanins are colored flavonoids that attract animals

b) Flavonoids are phenolic compounds that include a wide range of colored substances

c) Carotenoids are coloured terpenoid compounds that also serve as accessory pigments in photosynthesis

d) most widespread group of pigmented carotenoids is the anthocyanins, these are glycosides that have sugars. Without their sugars, anthocyanins are known as anthocyanidins

Which of the following is incorrect statements of these pigments;

#Question id: 2422

#Unit 2. Cellular Organization

 What actin-binding protein mediates gel-sol transitions?

#Question id: 2423

#Unit 2. Cellular Organization

What is the function of thymosin beta-4?

#Question id: 2424

#Unit 2. Cellular Organization

Which of the following statements correctly describe(s) actin?

a. Actin is a highly conserved protein.

b. Multiple actin genes may be found in higher eukaryotes.

c. Actin is the most abundant protein in a eukaryotic cell.

d. Individual actin filaments can be observed by electron microscopy.

e. One end of an actin filament is different from the other. 

#Question id: 2425

#Unit 2. Cellular Organization

Which of the following is (are) actin-based structures?

a. adherins belt                        b. contractile ring        c. mitotic spindle

d. nuclear lamina         e. stress fibers

#Question id: 2426

#Unit 2. Cellular Organization

Actin assembly in vitro

a. consists of three phases.     

b. requires addition of actin oligomers termed nuclei.

c. requires ATP hydrolysis.

d. is reversible.

e. requires actin-binding proteins.

#Question id: 2427

#Unit 2. Cellular Organization

Known functions of actin-binding proteins include

a. severing of long filaments to generate shorter filaments.

b. inhibition of filament polymerization.                   

c. bundling of filaments.

d. acceleration of filament polymerization rates.

e. capping of the (+) end.