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BIO 1021 Exam 1 questions with correct answers 2024/2025
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BIO 1021 Exam 1 questions with correct answers 2024/2025
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BIO 1021 Exam 1The fundamental unit of life is the - ANSe. cell.
Heterotrophs obtain their energy from - ANSc. other organisms.
The initial accumulation of oxygen in the atmosphere was the result of photosynthesis from
an organism most like modern - ANSa. cyanobacteria (blue green algae).
Ozone is important to life on Earth because it - ANSc. blocks much ultraviolet radiation.
Eukarya include - ANSe. All of the above
The part of the atom that determines how the atom behaves chemically is the - ANSb.
electron.
Because atoms can have the same number of protons but a different number of neutrons,
elements have - ANSa. isotopes.
All except _______ follow the octet rule. - ANSd. hydrogen
What is the difference between covalent and ionic bonds? - ANSe. Covalent bonds are the
sharing of electrons between atoms, whereas ionic bonds are the transfer of electrons from
one atom to another.
Sweating is a useful cooling device for humans because water - ANSa. takes up a great deal
of heat in changing from its liquid state to its gaseous state.
What is the difference between an acid and a base? - ANSe. An acid releases H+ ions in
solution, whereas a base accepts H+ ions.
Cholesterol is composed primarily of carbon and hydrogen atoms. Which property would you
expect cholesterol to have? - ANSa. It is insoluble in water.
The functional group written as —COOH is called the _______ group. - ANSe. carboxyl
Surface tension and capillary action occur in water because it - ANSc. has hydrogen bonds.
In condensation (dehydration) reactions, the atoms that make up a water molecule are
derived from - ANSc. both of the reactants.
You have isolated an unidentified liquid from a sample of peanuts. You add the liquid to a
beaker of water and shake vigorously. After a few minutes, the water and the other liquid
separate into two layers. To which class of large biological molecules does the unknown
liquid most likely belong? - ANSb. Lipids
, You look at the label on a container of shortening and see "hydrogenated vegetable oil." This
means that during processing the number of carbon-carbon double bonds in the oil was
decreased. What is the result of decreasing the number of double bonds? - ANSb. The oil is
now a solid at room temperature.
The portion of a phospholipid that contains the phosphorous group has one or more electric
charges. That makes this region of the molecule - ANSb. hydrophilic.
In a biological membrane, the phospholipids are arranged with the fatty acid chains facing
the interior of the membrane. As a result, the interior of the membrane is - ANSa.
hydrophobic.
Glucose and fructose both have the formula C6H12O6, but the atoms in these two
compounds are arranged differently. Glucose and fructose are known as - ANSa. isomers.
A nucleotide contains a pentose sugar, a phosphate group, and a(n) - ANSc.
nitrogen-containing base.
In animals, carbohydrate is stored in the form of - ANSc. glycogen.
The primary structure of a protein is determined by its - ANSc. sequence of amino acids.
When a protein loses its three-dimensional structure and becomes nonfunctional, it is -
ANSc. denatured.
The _______ structure of a protein concerns the way separate polypeptides are assembled
together. - ANSd. quaternary
Miller-Urey showed that in any environment with conditions similar to those of Earth, - ANSa.
inorganic molecules would react to form organic molecules.
Lipids such as cholesterol are synthesized by - ANSc. the SER (smooth endoplasmic
reticulum).
What is the major distinction between prokaryotic and eukaryotic cells? - ANSa. A
prokaryotic cell does not have a nucleus, whereas a eukaryotic cell does.
Which of the following is (are) found in prokaryotic cells? - ANSd. Ribosomes
Which of the following is a general function of all cellular membranes? - ANSa. They
regulate which materials can cross the membrane.
Microtubules are made of - ANSb. tubulin, and they are found in cilia.
Chloroplasts are the structures in which - ANSd. sunlight energy is converted into chemical
energy.
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