HW ch4

What is a cell not able to do if it does not have receptor proteins?

bind to signal proteins from other parts of the body.

What is the function of the nucleolus?

codes for the synthesis of ribosomal RNA

Both prokaryotic and eukaryotic cells have these characteristics in common

cytoplasm, a plasma membrane, and DNA.

A characteristic of a prokaryotic cell is that it

does not have a membrane-bound nucleus.

In order to observe the cilia on the surface of a paramecium (a single celled organism), what is the best device to use?

electron microscope.

What is a possible outcome if certain tissues did not have tight junctions?

fluids may leak out past the barrier the junction would create.

What organelle would help assist in the loss of the tail during the metamorphosis of a tadpole into a frog?

lysosomes

Which organelle produces ATP needed for cellular work?

mitochondria

Match the CORRECT organelle to its function?

mitochondrion - cell respiration

Which organelle is not correctly paired to its function?

plasma membrane - provides strength to plant cell walls

What structure allows plant cells to communicate with each other?

plasmodesmata

Mitochondria are necessary to ______________________ in both plants and animals.

produce ATP.

Which molecule would be able to pass freely through a plasma membrane?

CO2

Mitochondria and chloroplasts both ________; but are different in that mitochondria, but not chloroplasts, ______________.

are involved in energy conversions; are found in nearly all eukaryotic cells

Which of the following is an INCORRECT match?

smooth endoplasmic reticulum - storage of water

The size of a cell is limited because of _____________ , which is critical to a cell's function.

surface area to volume ratio

What do Eukaryotic cells use to move their organelles?

the cytoskeleton.

Receptor proteins

transmit information from outside the cell so that the cell can respond to stimuli.

Select the statement that accurately compares plant and animal cells?

Both plant and animal cells have a plasma membrane and plant cells also have a cell wall.

Which is the function of a chloroplast?

It converts light energy into chemical energy.

The hydrophilic portion of a plasma membrane faces the outside of the cell and the cytoplasm.

True

The endomembrane system does not

act as the control center of the cell

The plasma membrane blocks the passage of most molecules, therefore it is necessary for many molecules to

pass through the membrane via proteins.

Junction proteins do not

permit cells to recognize one another.

Both plants and animals are eukaryotes, however they diffract in their cellular structure. What is the difference in their cellular structure?

plants have a cell wall