Question

1 A)One of the functions of the nucleolus is

	a.	the synthesis of ribosomal RNA
	b.	the synthesis of messenger RNA, ribosomal RNA, and transfer RNA
	c.	the synthesis of messenger RNA
	d.	the synthesis of transfer RNA

B)

The fluid mosaic model of cell membranes states that phospholipids ___________

	a.	can move laterally along the plane of the membrane
	b.	frequently flip-flop from one side of the membrane to another
	c.	occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane
	d.	have hydrophilic tails in the interior of the membrane

Answer 1

1 A)The correct answer is option a

One of the functions of the Nucleolus is the synthesis of ribosomal RNA.

mRNA synthesis occurs in the cytoplasm and tRNA synthesis occurs in the nucleus.

B)The correct answer is option a.

The fluid mosaic model of cell membranes states that phospholipids can move laterally along the plane of the membrane.

This ability to move within the membrane is measured as its fluidity.

The flip-flop of phospholipids is not explained by fluid mosaic model.

It is a phospholipid bilayer which is interrupted at certain sites where the integral proteins and other molecules form a part.

The tails are hydrophobic and are located towards the interior of the membrane and the polar heads heads towards the outer sides.