Biology 311c Exam 1 Review Questions And Solved Correctly.
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Course
BIO 311C
Institution
BIO 311C
basic unit of life - Answer cell
8 emergent properties of living organisms - Answer reproduction, growth and development, order and structure, metabolism, respiration, response to environmental stimuli, adaptation and evolution, autonomous
model system - Answer Representative organis...
Biology 311c Exam 1 Review Questions
And Solved Correctly.
basic unit of life - Answer cell
8 emergent properties of living organisms - Answer reproduction, growth and development, order and
structure, metabolism, respiration, response to environmental stimuli, adaptation and evolution,
autonomous
model system - Answer Representative organism or a cell type used for conducting simple or complex
biological experiments
model systems are normally - Answer easy to grow, manipulate, and study
Which of the following molecules is the most polar? and why? A) CO2 B) CH4 C) CH3OH D) C2H6 E) O2 -
Answer CH3OH. The largely electronegative oxygen causes a dipole moment and creates a strong
polarity within the molecule.
When sodium with one electron and chlorine with seven electrons in their valence shells respectively
interact, they will form _________. - Answer ionic bonds. forms between metal and nonmetal it
becomes NaCl
Which of the following bonds will break when you blow-dry wet hair? - Answer H-bonds bc it mainly
holds together water molecules
Which of the following is the correct ranking of the three bonds and interactions in order from highest to
lowest in terms of their bond strength between two side chains of a protein in their tertiary structure?
I. Disulfide (-S-S-) bond between two cysteines
II. Hydrophobic interactions between two leucines
III H-bonding in water - Answer I, III, II. Covalent bonds are the strongest, followed by Hydrogen bonds,
then any type of nonpolar/hydrophobic interactions and London dispersion forces. (Ionic bonds are
stronger than covalent bonds, but is not mentioned in this question).
, Biologists say covalent bonds are stronger than ionic bonds and chemists say ionic bonds are stronger
than the covalent bonds.
Both are correct but what makes the difference? - Answer WATER MAKES THE DIFFERENCE
Soap can be used to remove both grease (nonpolar) and salt (polar).
What property makes soap so versatile? - Answer soap is amphipathic
You have used dishwashing soap in your dishwasher instead of dishwasher detergent by mistake. When
the dishwasher started, it resulted in a lot of foam coming out and flooding the kitchen floor.
What is the chemical that can be found in your kitchen that will break down the bubbles and eliminate
foaming? - Answer add some salt
How does the spreading of salt on the roads reduce ice formation? Briefly state the mechanism in a few
words. - Answer salt breaks the h bonds
Which of the following is the most important property of water to support life? - Answer reactant and
medium. Water is an essential medium and important reactant in many biochemical reactions such as
photosynthesis and hydrolysis.
Even though H-bonding occurs in ammonia and ethanol, they cannot be used to replace water in living
cells because ___________________. - Answer they have a hydroxyl group
How many grams of fat would be found in 1 gallon (3700 ml) of 2% milk? - Answer 74
When the pH of a Northern Lake, changed from 7 to 5 due to acid rain, the H+ ion concentration would
_____________(increase or decrease) by _________ fold. - Answer increase, 100
Which of the following compounds would have the greatest number of molecules in a sample of 100
grams each?
Note: Atomic mass of H = 1, C = 12 and O = 16. - Answer CH4. 2g x 1mol/16g x 6x10^23 molecules/1
mol = 7.5x10^22
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