Biology

In the accompanying figure, what is the role of the structures between the membranes?

They allow the transport of small molecules and ions between adjacent cells.

Which of the following is not a property of membranes?

They inhibit the passage of materials.

What happens during the cotransport of glucose and sodium ions?

Both D and E

The force necessary to cause microtubules of cilia and flagella to slide alongside one another is provided through the action of ____ proteins, which derive the energy to perform their work directly from ____ molecules.

dynein; ATP

When the net movement of water in and out a cell is zero, that solution is said to be

isotonic.

What does the nucleolus, within the nucleus, synthesize?

ribosomal RNA

Which statement about centrioles is false?

They have a 9 + 2 arrangement of microtubules.

Almost every vertebrate cell has a primary cilium, a single cilium on the cell surface that serves as a cellular antenna.

true

Cells that secrete large amounts of glycoprotein have many Golgi stacks.

true

The term "fluid mosaic model" refers to

the movement of lipids and integral proteins within the lipid bilayer.