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BIO 1100 Exam 1 (Ch 1-5) Solved 100%
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BIO 1100 Exam 1 (Ch 1-5) Solved 100%
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BIO 1100 Exam 1 (Ch 1-5) Solved 100%A basic difference between a prokaryotic cell and eukaryotic cell is that the prokaryotic
cell - ANSWER-lacks a nucleus
A cell's plasma membrane contributes to homeostasis by: - ANSWER-acting as a
selective barrier
A denatured protein differs from a normal protein because it - ANSWER-has lost its
usual secondary and tertiary structures
A lipid bilayer would be least fluid if the membrane's lipid groups were exclusively of this
type: - ANSWER-saturated fatty acids
A mutation is - ANSWER-a change in DNA sequence
A nucleolus is - ANSWER-an area in the nucleus of eukaryotic cells where ribosomes
are synthesized and assembled
A particular cell has the following molecules and structures: enzymes, DNA, ribosomes,
plasma membrane, and mitochondria. It could be a(n) __________ cell. - ANSWER-
plant or animal
A scientific explanation that is conditional and requires more investigation is called a(n) -
ANSWER-hypothesis
After you drink a glass of acidic lemonade, your body's pH does not change. This is an
example of how humans and other organisms - ANSWER-maintain precise internal
conditions through homeostasis
All cells have: - ANSWER-genetic information
Amphipathic lipids can form lipid bilayers in water because
A. their sugar-phosphate backbones provide the stability required by membranes
B. without this there could not be cells and consequently there could not be life
C. their polar and/or charged head groups associate well with water
D. the lipid tails associate away from water
E. C and D - ANSWER-C and D
An amphipathic molecule is one that: - ANSWER-contains both polar and nonpolar
regions
An mRNA is transcribed in the nucleus of a eukaryotic cell. Where is this mRNA
translated? - ANSWER-the cytosol
, Blood glucose concentration after a meal containing carbohydrate rises above 5 mM in
humans. Glucose concentration inside muscle cells is not much higher than 0 mM. If
muscle cells have facilitative glucose carriers in their plasma membranes, which way
would glucose diffuse after a meal? - ANSWER-into muscle cells
Carbon dioxide crosses the plasma membrane by simple diffusion. The rate at which
carbon dioxide enters the cell is determined by the - ANSWER-concentration of carbon
dioxide of each side of the cell membrane
Cell membranes do all of the following EXCEPT
A) provide attachments between cells
B) allow communication between cells
C) regulate the movement of substances between the cytoplasm of the cell and the
extracellular fluid
D) provide an energy source for the cell
E) isolate the cell's contents from the external environment - ANSWER-D) provide an
energy source for the cell
Chromosomes are made of - ANSWER-DNA and proteins
Flagellated cells can - ANSWER-move the cell through fluid
Food particles are digested by - ANSWER-endocytosis and digested with enzymes
produced at the lysosomes
For diffusion to occur, there must be - ANSWER-a gradient
Genes are segments of - ANSWER-DNA
HDL and LDL are different types of cholesterol found in the blood. These compounds
are - ANSWER-lipids
If all the lysosomes within a cell suddenly ruptured and released their contents, what
could occur? - ANSWER-the biological molecules in the cell would begin to degrade
If you examined the human body on a chemical composition basis, which of the
following combinations of elements would be most common? - ANSWER-O, C, H, N
Imagine you have a mysterious liquid from a sample of food. You add the liquid to a
beaker of water and shake vigorously. After a few minutes, the water and the other
liquid separate into 2 layers. To which class of biological molecules does the unknown
liquid most likely belong? - ANSWER-lipids
Imagine you have radioactively labeled a protein in the lumen of the endoplasmic
reticulum. Where would you predict the labeled protein might end up?
A. in the lumen of the Golgi apparatus
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