Cellular Level of Organization 50 question practice test

Multiple Choice:

1. The plasma membrane is best described as a:
A. Rigid wall that blocks all substances
B. Flexible, selective barrier
C. DNA storage unit
D. Energy producer
2. The cytosol is:
A. The nucleus of the cell
B. The fluid inside the nucleus
C. The fluid between the plasma membrane and nucleus
D. The outer membrane
3. The nucleus contains the cell’s:
A. Lipids
B. Proteins
C. DNA
D. ATP
4. The hydrophilic part of a phospholipid is the:
A. Fatty acid tail
B. Phosphate head
C. Protein head
D. Lipid tail
5. The hydrophobic portion of a phospholipid is the:
A. Phosphate group
B. Fatty acid tails
C. Protein region
D. Polar head
6. The phospholipid bilayer prevents easy passage of:
A. Lipid-soluble molecules
B. Nonpolar molecules
C. Charged and polar molecules
D. Oxygen
7. Simple diffusion allows movement of:
A. Charged ions
B. Polar molecules
C. Nonpolar hydrophobic molecules
D. Proteins

, 8. Channel-mediated facilitated diffusion uses:
A. ATP
B. DNA
C. Ion channels
D. Ribosomes
9. Carrier proteins transport substances by:
A. Breaking the membrane
B. Changing shape
C. Producing ATP
D. Destroying molecules
10. Active transport moves substances:
A. Down their concentration gradient
B. Without energy
C. Against their concentration gradient
D. Through simple diffusion
11. Active transport requires:
A. Oxygen
B. Water
C. ATP
D. DNA
12. Endocytosis is the movement of substances:
A. Out of the cell
B. Into the cell
C. Across the nucleus
D. Into mitochondria
13. Exocytosis is the movement of substances:
A. Into the cell
B. Out of the cell
C. Into cytosol
D. Into ribosomes
14. Transcytosis moves substances:
A. Into the nucleus
B. Out of mitochondria
C. Across the cell
D. Into ribosomes
15. In an isotonic solution, a cell will:
A. Swell
B. Shrink
C. Maintain its normal shape
D. Burst