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1
Robert Hooke first described cells by looking at thin slices of _____________________.
A)honeycomb.
B)skin.
C)cork.
D)bacteria.
2
What limits cell size?
A)Surface-to-volume ratio.
B)Speed of movement of materials from the middle to the periphery of the cell.
C)The bigger the cell, the less access there is from the exterior of the cell to the inside of the cell.
D)All of the above limit cell size.
3
Which of the following structures contain microtubules?
A)cilia
B)flagella
C)centrioles
D)all of the above
4
Chromosomes _____________________.
A)are located in the nucleus.
B)contain DNA.
C)are only visible at certain times with a light microscope.
D)all of the above characterize chromosomes
5
The smooth endoplasmic reticulum ________________.
A)synthesizes minerals.
B)synthesizes carbohydrates and lipids.
C)functions as structural support for the cell.
D)synthesizes ribosomes.
6
The net movement of molecules down a concentration gradient is __________________.
A)osmosis.
B)osmotic pressure.
C)diffusion.
D)exocytosis.
7
Which of the following can move freely across a plasma membrane?
A)sugar
B)protein
C)urea
D)water
8
A red blood cell placed in pure water will burst because ______________.
A)osmotic pressure increases inside the cell.
B)the solution surrounding the cell is hypotonic.
C)the cell is hypertonic.
D)all of the above
9
Which one of the following terms is not related to a substance entering a cell?
A)endocytosis
B)exocytosis
C)phagocytosis
D)pinocytosis
10
Movement of molecules through channels in the plasma membrane in only one direction by the expenditure of energy is ____________.
A)osmosis.
B)diffusion.
C)active transport.
D)facilitated diffusion.
11
Lysosomes recycle and digest worn out cell components.
A)True
B)False
12
The Golgi complex synthesizes proteins.
A)True
B)False
13
Energy for the cell is generated by the mitochondrion.
A)True
B)False
14
Chloroplasts are found only in plants.
A)True
B)False
15
Cell vacuoles are comprised of empty space.
A)True
B)False
16
Cell walls in plants are composed of cellulose.
A)True
B)False
17
The chemical reactions of photosynthesis occur on the membranes of the mitochondrion.
A)True
B)False
18
Cell membranes are composed of a delicate protein sheet.
A)True
B)False
19
There are 2 major kinds of cells: prokaryotes and eukaryotes.
A)True
B)false
20
Diffusion is the movement of water molecules across a semi-permeable membrane which continues until equilibrium has been reached.
A)True
B)False





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