Bio 1050 Exam 2 Practice Questions and Correct Answers
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Course
BIO 1050
Institution
BIO 1050
Lipids _________ are a second group of macromolecules important to all living organisms. __________ are made primarily from atoms of carbon, hydrogen, and oxygen, just as carbohydrates are, but the atoms are in different proportions
there are significantly more C-H bonds and significantly more ene...
Bio 1050 Exam 2 Practice Questions and
Correct Answers
Lipids ✅_________ are a second group of macromolecules important to all living
organisms. __________ are made primarily from atoms of carbon, hydrogen, and
oxygen, just as carbohydrates are, but the atoms are in different proportions
there are significantly more C-H bonds and significantly more energy stored in what?
✅Lipid Molecules
T or F: Lipids do not dissolve in water. ✅True! They consist mostly of hydrocarbons,
which are non-polar. They are also greasy to the touch.
According to the theory of endosymbiosis, the origin of chloroplasts probably involved:
✅engulfing of small photosynthetic prokaryotes by larger cells.
The net movement of molecules from locally concentrated regions to uniform
distributions is best described as: ✅diffusion
Shortening has "partially hydrogenated vegetable oil" as an ingredient. This means that
during processing the number of carbon-carbon double bonds in the oil was reduced.
What is the result of decreasing the number of double bonds? ✅More likely to be solid
at room temperature
Which of the following organelles are enclosed by a double membrane?
A. All organelles are enclosed by a double membrane.
B. mitochondria and chloroplasts
C. the nucleus and the Golgi apparatus
D. ribosomes and lysosomes
E. vacuoles and the endoplasmic reticulum ✅mitochondria and chloroplasts
Which of the following facts supports the claim that mitochondria developed from
bacteria that were long ago phagocytosed into eukaryotic cells?
A. Mitochondria have proteins for the synthesis of ATP.
B. Mitochondria are small and easily transported across the membrane.
C. Mitochondria have their own DNA.
D. Mitochondria are the "powerhouses" of the cell. ✅Mitochondria have their own
DNA.
Saturated fatty acids have _________________ than unsaturated fatty acids, which is
why they exist as a ____________ at room temperature. ✅fewer double bonds; solid
, Which of the following is not an important biological function of lipids?
A. insulation
B. regulation of growth and development
C. energy storage
D. protection of internal organs and tissues
E. All of the above are true. ✅All of the above are true.
If the solution surrounding a cell contains less solute than the cytoplasm, the osmotic
condition is said to be: ✅hypotonic
How are phospholipid molecules that make up the surface membrane of a cell
organized? ✅A two-layered structure is formed, with the hydrophobic tails facing in to
each other, sandwiched between the hydrophilic heads that face the interior of the cell
and the exterior environment.
You are bored at a lunch meeting and surreptitiously place a raisin in your glass of
water. The raisin swells to twice its original size. Relative to the water, the raisin must
have been: ✅hypertonic.
Which of the following is found in both prokaryotic and eukaryotic cells?
A. ribosome
B. lysosome
C. Golgi apparatus
D. centriole
E. peroxisome ✅ribosome
Active transport, the moving of molecules from areas of low concentration to that of high
concentration across the membrane, is usually coupled to processes that: ✅cost
energy.
Which statement is NOT part of the modern cell theory?
A. Cells contain hereditary information that passes from one generation of cells to the
next.
B. The first cell arrived on earth from outer space.
C. All living organisms consist of one or more cells.
D. Cells arise from other cells. ✅The first cell arrived on earth from outer space.
Which of the following BEST defines diffusion?
A. net movement of particles from areas of low concentration to areas of high
concentration
B. net movement of fluids from the environment into and out of an organism
C. net movement of particles between cells
D. net movement of particles from areas of high concentration to areas of low
concentration ✅net movement of particles from areas of high concentration to areas of
low concentration
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