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Barry - Biology 115 - Exam #1 Pre-Test fully solved
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Barry - Biology 115 - Exam #1 Pre-Test fully solved
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Barry - Biology 115 - Exam #1 Pre-Testfully solved
A chlorine anion has ____ electrons in its outermost shell - correct answer ✔✔8
A large concentration of negatively charged ions inside a cell will... - correct answer ✔✔attract positive
ions
A friend of yours calls to say that his car would not start this morning. He asks for your help. You say that
you think the battery must be dead. If so, then jump-starting the car from a good battery will solve the
problem. In doing so, you are _____ - correct answer ✔✔stating a hypothesis and using that hypothesis
to make a testable prediction
A glycosidic linkage in a carbohydrate is analogous to which of the following in proteins? - correct answer
✔✔a peptide bond
A hydrolysis reaction requires... - correct answer ✔✔water
an enzyme
A triglyceride requires ___ ________ reactions to attach the glycerol head to the nonpolar _________
tails - correct answer ✔✔3 dehydration reactions to attack the glycerol head to the nonpolar fatty acid
tails
An atom with a neutral charge must have... - correct answer ✔✔equal numbers of protons and electrons
Celery stalks that are immersed in freshwater for several hours become stiff. Similar stalks left in a 0.15
M salt solution become limp. From this we can deduce that the freshwater... - correct answer ✔✔is
hypotonic and the salt solution is hypertonic to the cells of the celery stalks
Chitin is a _____ used for _____ and found primarily in ______ - correct answer ✔✔a carbohydrate used
for structure and found primarily in animals and fungi
, Cooking oil and gasoline (a hydrocarbon) are NOT amphipathic molecules because they... - correct
answer ✔✔do not have a polar or charged region
Helium has an atomic number of 2. How many electrons are in its outermost shell? - correct answer
✔✔2
Hydrogen bonds form between nitrogenous bases of nucleotides in DNA and some RNAs. What does this
tell you about the bonds within these nucleotides? - correct answer ✔✔nucleotides must contain at
least some polar covalent bonds
If you mechanically shook a mixture of phospholipids and water, what would you expect to see when you
observe the solution using an electron micrscope? - correct answer ✔✔Some lipids will have formed tiny
vesicles filled with water.
If you were to remove a proton from an atom it would create... - correct answer ✔✔an ion (and likely an
isotope) of a different element
You are examining a newly discovered organism that you found living in an extremely cold (10 degrees C)
environment. You notice that its cellular membrane has 50% of its lipids as cholesterol molecules
dispersed throughout the phospholipids. If you were to place this organism in an even colder
environment (0 degrees C), what would you expect to see change in regard to cell membrane
permeability to glycerol? Hint: Read the graph very carefully - correct answer ✔✔The membrane's
permeability to glycerol would not change.
Lithium has an atomic number of 3. How many electrons are in its outermost shell? - correct answer
✔✔1
Louis Pasteur's experiment had a good design because... - correct answer ✔✔the possible outcomes led
to distinct, unambiguous conclusion
Proteins can have up to a ____ structure. A single polypeptide can only have up to a ____ structure,
however. - correct answer ✔✔proteins - quaternary structure
polypeptide - tertiary structure
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