Unit 2 Cell Review

Unit 2 Cell Review

Unit 2 Cell Review

• Cell Theory

• Prokaryotes vs Eukaryotes

• Plants vs Animals

• Membrane Transport

Multiple Choice

Cell theory is a result of the contributions of several different scientists, and applies to all living things. Which of the following explains why cell theory will not ever become the law of cells?

• Cells of different organisms are so diverse that it is impossible to come up with a law that would apply to all of them.

• Because cells undergo change as mutations occur within them, developing anything beyond a cell theory would be impractical.

• Scientific theories are well-tested explanations, while laws are well-tested descriptions of natural phenomena; one cannot become the other.

• Scientific theories can only become laws if all possible cases can be tested; it would be impossible to test all living things to see if they have cells.

Multiple Choice

Cell theory was first proposed in 1838. Evidence obtained through additional scientific investigations resulted in the current cell theory. Which statement describes a component of the original cell theory that was removed because of the new scientific knowledge?

• All living things are made of cells.

• All cells come from other preexisting cells.

• Cells form through spontaneous generation.

• Cells are the basic structural and functional units of life.

Multiple Choice

In the mid-nineteenth century, the discoveries of many scientists, including Matthias Schleiden, Theodor Schwann and Rudolph Virchow were combined to develop the modern cell theory. Which of the following statements is NOT part of cell theory?

• Cells are produced from existing cells

• Cells are the basic units of structure in living things

• All cells have the same internal structure

• All living things are made of cells

Multiple Choice

What structures are common in all prokaryotic and eukaryotic cells?

• cell wall, ribosomes and nucleus

• cell membrane, nucleus, mitochondria

• cell membrane, cytoplasm and ribosomes

• chloroplast, cell membrane and cytoplasm

Multiple Choice

Which statement correctly explains a difference between the cells of prokaryotes and the cells of eukaryotes?

• Eukaryotic cells have a nucleus and membrane-bound organelles; prokaryotic cells lack these features.

• Eukaryotic cells have fewer distinct parts than prokaryotic cells because they are less evolved.

• Eukaryotic cells do not have cell walls or vacuoles; prokaryotic cells have both of these features.

• Eukaryotic cells reproduce using DNA; prokaryotic cells use RNA only to reproduce.

Multiple Choice

There are some similarities between prokaryotic and eukaryotic cells. Which of the following structures is found in both prokaryotic and eukaryotic cells?

• Lysosome

• Mitochondria

• Nucleus

• Ribosome

Multiple Choice

Which of the following structures would be present in a plant cell, but not in an animal cell?

• nucleus, mitochondria, chloroplasts

• cell wall, mitochondria, Golgi apparatus

• central vacuole, Golgi apparatus, nucleus

• chloroplasts, cell wall, central vacuole

Multiple Choice

Which of the following pairs incorrectly matches a cell structure with its function?

• mitochondrion . . . cellular energy

• ribosome . . . manufacture of proteins

• lysosome . . . movement

• central vacuole . . . storage

Multiple Choice

The diagram above represents a cell of a green plant.

Solar energy is used to produce energy-rich compounds in which structure?

• A

• B

• C

• D

Multiple Choice

Which of the following best explains the difference between passive and active transport within cell membranes?

• Passive transport does not require chemical energy to occur; active transport requires energy, such as ATP.

• Passive transport happens only in the presence of water, while active transport does not require water to occur.

• Passive transport moves larger substances through the cell membrane; smaller molecules must move by active transport.

• Passive transport allows whole particles to move through the membrane, while active transport breaks particles down before they can pass through.

Multiple Choice

A teacher has set up a model to represent osmosis.

The model is shown in the diagram above.

Which structure is represented by the object in the center of the beaker, labeled X?

• vacuole

• cell membrane

• nucleus

• mitochondria

Multiple Choice

Look at the cross section of a cell membrane of a eukaryotic cell. H+ ions are being pumped from a low concentration to a high concentration. How do you describe this type of transport across the cell membrane?

• Active transport

• Passive transport

• Facilitated diffusion

• Co-transport

Multiple Choice

The cell membrane of the red blood cell will allow water, oxygen, and carbon dioxide to pass through. Because other substances are blocked from entering, this membrane is called

• perforated

• semi-permeable

• non-conductive

• permeable