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