Bio Chapter 4

The glycoproteins found in the plasma membrane function in what capacity?

To allow one cell to recognize another of the same type or from the same body

Plant cells can communicate with each other via ________, as indicated by the arrow in the figure.

plasmodesmata

In which way are vesicles different from vacuoles?

they are smaller

Which of the following is not a function of junction proteins?

To permit cells to recognize one another

A general eukaryotic cell is typically in the area of

10-100 micrometers

Resolving power is the

Ability to tell two points apart as separate points

Which of the following would be able to pass freely through the plasma membrane?

CO2

Without tight junctions in certain tissues

Fluids may leak out past the barrier the junction would create

The nucleus has a double membrane that encloses the DNA. Inside the nucleus, the DNA acts as the template to produce mRNA and ribosomes. To exit the nucleus these molecules must

Pass through pores that span both membranes

Which of the following is not a possible function of the extra cellular matrix in animal cells?

Produces numerous channels for continuous flow of water from cell to cell

Which of the following is not a type of intracellular protein?

Cellulose

What function does the nucleus have?

Codes for the synthesis of ribosomal RNA

Surface area to volume ration is an important characteristic for cell function; some cells increase their ratio by

Developing finger like projections.

Stacks of what look like chromoplasts are called?

Granum

Which of the following is not involved in producing substances needed by a cell?

Lysosome

Which structures determine the flexibility of the extra cellular matrix?

Proteins

Which of the following is the correct sequence for an altered protein that is secreted from the cell?

Rough ER - Golgi apparatus - plasma membrane

Eukaryotic cells have DNA enclosed in a double membrane called the nucleus. The nucleus functions to

Separate the DNA from other activities that occur in the cytoplasm

The only molecules that can pass freely through the plasma membrane are ones that are

Small and hydrophobic