Exam (elaborations)
BS 161 Exam 1 - Questions & Detailed Answers (Graded A+)
BS 161 Exam 1 - Questions & Detailed Answers (Graded A+)
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BS 161 Exam 1 - Questions & Detailed Answers (GradedA+)
Characteristics of all living and nonliving materials Right Ans - they both
conform to the basic laws of chemistry and physics
All cells have a _____ while not all cells have a ______ Right Ans - plasma
membrane; nuclear membrane
all chemical reactions in a cell are required to sustain life are referred to as
Right Ans - metabolism
What illustrates that the amount of energy before and after eating a
hamburger are the same Right Ans - first law of thermodynamics
What will decrease entropy in a cell(increase entropy of surrounding)
Right Ans - linking together amino acids to build a large protein
flow of information in the central dogma Right Ans - info in DNA is
transcribed to RNA, which carries info to make a protein
what is produced during translation Right Ans - proteins
in the ___ group, a change is introduced. in the ____ group, the change is not
introduced Right Ans - test; control
feature of a group that is changed from one treatment to the next Right Ans
- variable
common features of all living organisms Right Ans - ability to store info in
DNA, presence of a plasma membrane, ability to capture energy from the
environment
What kind of bond joins hydrogen to oxygen in a water molecule? Right
Ans - polar covalent bond
, The hydrogen atoms in a water molecule have a ________ charge while the
oxygen atom has a _________ charge. Right Ans - partial positive; partial
negative
What else is necessary in order for a hydrogen atom in a molecule to
participate in a hydrogen bond? Right Ans - It must be bonded to a more
electronegative atom.
The designation of a magnesium ion as Mg2+ indicates an atom that has:
Right Ans - lost two electrons and is positively charged.
A pair of shared valence electrons is referred to as a(n): Right Ans -
covalent bond.
The ability of atoms to attract electrons is referred to as: Right Ans -
electronegativity.
The tendency of nonpolar molecules to self-associate in water rather than
dissolve is called the: Right Ans - hydrophobic effect.
Which of the molecules is classified as an organic molecule? Right Ans -
CO2- has Carbon atom
A _______ substance could contain __________ bonds which allow it to interact
with water. Right Ans - hydrophilic; polar covalent
In a solution that has pH = 6.0: Right Ans - there is a higher concentration
of hydrogen ions than hydroxide ions
By definition, an ionic interaction occurs between: Right Ans - a positively
charged molecule and a negatively charged molecule
Imagine you are looking at a bottle of salad dressing containing oil, vinegar,
and water. You notice that the oil sits on "top" of the other liquids. This is due,
in part, to the fact that: Right Ans - oil is hydrophobic.
A fatty acid contains primarily carbon and hydrogen atoms, and its
hydrocarbon tail is very hydrophobic. What kind of interaction can occur
between hydrocarbon tails of fatty acids? Right Ans - Van der Waals
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