Ch 7 Review Questions Question Preview (ID: 33438)
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In which structure would you find a nucleus?
a) prokaryote
b) bacterial cell
c) plant cell
d) virus
Both Schwann and Virchow developed important theories about cells in the mid 1800s. Which best explains the reason these theories were made within a few years of each other?
a) Hooke's Micrographia inspired both theories
b) New microscopes provided better viewing of cells
c) Scientists invented the microscope in the mid 1800s
d) The electron microscope was used for the first time
Which statement would not be included in a summary of the cell theory?
a) all cells come from other, preexisting cells
b) all cells contain a nucleus that controls cell division
c) the cell is the basic unit of organizaiton
d) all organisms are made of at least one cell
In what decade did the cell theory become an accepted part of biology?
a) 1620s
b) 1940s
c) 1850s
d) 1980s
A scientist at the polar ice cap was studying an ice sample. While examining it, he found some cell from many years ago. He ID'd these structures: cytoskeleton, mitochondria, nucleus, cell wall, ribosomes. What kind of organism did he find?
a) animal
b) bacteria
c) plant
d) not enough info to decide
Which statement is true about bacterial cells?
a) the cells are very large
b) the cells have no nucleus
c) they are eukaryotes
d) they have organelles
On a laboratory exam, a student is asked to determine if the cells under a microscope are plant cells or animal cells. What might the student look for?
a) a cell membrane and mitochondria
b) ribosomes and vacuoles
c) chloroplasts and a cell wall
d) a nucleus and ribosomes
Which scientist revolutionized the way biologists think about the evolutionary history of eukaryotes?
a) Virchow
b) Pasteur
c) Everett
d) Margulis
An electron microscope can magnify an object about 500,000 times. How does this magnification compare with the magnification of a compound light microscope?
a) 500 times lower
b) 100 times lower
c) 100 times higher
d) 500 times higher
Which defines a cell?
a) the smallest type of animal
b) the basic unit of living things
c) microscopic organisms in water
d) protein molecules in animals
Cholesterol is repelled by water and can be found between the layers of the phospholipids in the plasma membrane. What can be concluded from this information?
a) A high cholesterol diet should be avoided.
b) Cholesterol is nonpolar.
c) Cholesterol is polar.
d) Cholesterol is repelled by the polar tails.
Which substance on the plasma membrane helps identify chemical signals from outside the cell?
a) carbohydrate chain
b) cholesterol
c) membrane protein
d) transport protein
Where are you least likely to find water in the phospholipid bilayer?
a) polar phosphate heads
b) between fatty acid tails
c) transport protein
d) carbohydrate
19. What would happen to the phospholipid bilayer if cholesterolIt would become more rigid. is completely removed?
a) It would become more rigid.
b) It would disintegrate.
c) It would have holes in it.
d) It would collapse in on itself.
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