Quiz 2. Date: June 25: 15 points
Circle one answer only.
1. Which of the following is not present in all eukaryotic cells?
A. endoplasmic reticulum
B. ribosome
C. plasma membrane
D. cell wall
E. Golgi bodies
2. Plants, fungi, and bacteria share which one of the following
characteristics?
A. cell walls
B. nuclear membranes
C. nuclei
D. lysosomes
E. vesicles
3. The chromosomal hereditary material is packaged in this organelle in
eukaryotic cells but not in prokaryotic cells. This organelle is
A. mitochondria.
B. chloroplasts.
C. plasma membrane.
D. nucleus.
E. centrioles.
4. Carrier-mediated transport is also called
A. facilitated diffusion.
B. active transport.
C. exocytosis.
D. endocytosis.
E. phagocytosis.
5. A type of transport of a solute across a membrane, up its concentration
gradient, using protein carriers driven by the expenditure of chemical
energy is known as
A. osmosis.
B. diffusion.
C. facilitated transport.
D. active transport.
E. exocytosis.
6. In a chemical reaction in a living system, enzymes are used as
catalysts. Which of the following statements about enzymes is
incorrect?
A. Enzymes enter reactions and can be reused.
B. Enzymes speed up chemical reactions in living systems.
C. Enzymes reduce the energy of activation necessary for a chemical
reaction to go forward.
D. Enzymes increase the energy of activation necessary for a chemical
reaction to go forward.
E. Enzymes are sometimes referred to as biological catalysts; however,
not all biological catalysts are proteins.
7. The specificity of an enzyme is due to its active site. The active site is
shaped so that only a certain
A. substrate molecule can fit into it.
B. product molecule can fit into it.
C. reactant molecule can fit into it.
D. cofactor molecule can fit into it.
E. histone molecule can fit into
8. When an atom or molecule gains one or more electrons, it is said to
be
A. energized.
B. oxidized.
C. polarized.
D. activated. E. reduced
9. The endosymbiotic theory is supported by the finding of non-nuclear
DNA in which of the following organelles?
A. mitochondria and lysosomes
B. mitochondria and Golgi apparatus
C. mitochondria and chloroplasts
D. chloroplasts and Golgi apparatus
E. chloroplasts and lysosomes
10. The process often thought of as “solute/fluid" intake is
A. osmosis.
B. pinocytosis.
C. phagocytosis.
D. diffusion.
E. active transport
11. Steroid receptor is an example for
A. Intracellular receptor
B. Cell Membrane receptor
C. Both
D. None
E. Ion channel receptor
12. On the outer surface of the plasma membrane there are marker
molecules that identify the cell-type. Often these molecules are
A. ATP.
B. amino acids.
C. nucleotides.
D. carbohydrate chains.
E. inorganic ions
13. Osmosis can only occur if water travels through the
A. cell wall.
B. semi-permeable membrane.
C. vacuole.
D. ER.
E. cytoskeleton.
14. Which signaling mechanism is short lived?
A. Paracrine signaling
B. Synaptic signaling
C. Direct contact
D. Endocrine signaling
E. All
15. Direction of flow of solutes and ions in Diffusion.
A. high to low concentration
B. low to high concentration
C. low to low concentration
D. No direction
E. None
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