Which of the following apply to the synthesis of plant cell walls? Please select all that apply.

a) Cellulose microfibrils are formed by cellulose synthase complexes called rosettes

b) Cellulose is synthesized using cytoplasmic ATP-glucose and deposited as microfibrils directly on the outer surface of the plasma membrane.

c) Matrix polysaccharides of plant cell walls are synthesized in the Golgi apparatus and exported to the cell wall by endocytosis.

d) The direction of cellulose microfibril growth is determined by the orientation of arrays of microtubules lying just below the plasma membrane.

#Question id: 4976

#Unit 9. Evolution & Diversity of Life Forms

Which of these is the most likely explanation for the existence of dicynodont fossils on modern-day Antarctica?

#Question id: 4977

#Unit 9. Evolution & Diversity of Life Forms

There are at least a dozen known species in the extinct genus Lystrosaurus. If each species was suited to a quite different environment, then this relatively large number of species is likely due to

#Question id: 4978

#Unit 9. Evolution & Diversity of Life Forms

The dicynodonts survived the mass extinction that was most closely correlated in time, if not in cause, with

#Question id: 4979

#Unit 9. Evolution & Diversity of Life Forms

The dicynodonts that survived the Permian extinction would initially have had to endure (or escape from) the physical effects of __________, and subsequently, the biological effects of __________.

#Question id: 4980

#Unit 9. Evolution & Diversity of Life Forms

If an increase in dicynodont species diversity (i.e., number of species) occurred soon after the Permian extinction, and if it occurred for the same general reason usually given for the increase in mammalian diversity following the Cretaceous extinction, then it should be attributed to

#Question id: 4981

#Unit 9. Evolution & Diversity of Life Forms

An organism has a relatively large number of Hox genes in its genome. Which of the following is not true of this organism?