MOLECULAR BIOLOGY EXAM 1 WITH CORRECT SOLUTIONS
MOLECULAR BIOLOGY EXAM 1 WITH CORRECT SOLUTIONS
MOLECULAR BIOLOGY EXAM 1 WITH CORRECT SOLUTIONS
Which of the following can be described as the smallest living unit?
(a)DNA
(b)cell
(c)organelle
(d)protein - ANSWER-B. CELL
The flow of gene...
MOLECULAR BIOLOGY EXAM 1 WITH
CORRECT SOLUTIONS
Which of the following can be described as the smallest living unit?
(a)DNA
(b)cell
(c)organelle
(d)protein - ANSWER-B. CELL
The flow of genetic information is controlled by a series of biochemical reactions that
result in the production of
proteins, each with its own specific order of amino acids. Choose the correct series
biochemical reactions from the options presented here.
Proteins are important architectural & catalytic components within the cell, helping to
determine its chemistry, its shape, and its ability to respond to changes in the
environment. Remarkably, all of the different proteins in a cell are made from the same
20 __________. By linking them in different sequences, the cell can make protein
molecules with different conformations and surface chemistries, and therefore different
functions.
Changes in DNA sequence from one generation to the next may result in offspring that
are altered in fitness
compared with their parents. The process of change and selection over course many
generations is the basis of ____.
In a folded protein, most of the nonpolar amino acids are buried inside the protein fold,
whereas the polar and charged side chains are exposed to the components in the
cytosol. This fold is more stable because of the expulsion of nonpolar atoms from
contact with water, favoring the interaction of nonpolar atoms with each other. What is
this fourth type of noncovalent interaction called?
A protein chain folds into its stable and unique three-dimensional structure, or
conformation, by making many noncovalent bonds between different parts of the chain.
Such noncovalent bonds are also critical for interactions with other proteins and cellular
molecules. From the list provided, choose the class(es) of amino acids that are most
important for the interactions detailed below.
A.forming ionic bonds with negatively charged DNA
B.forming hydrogen bonds to aid solubility in water
C.binding to another water-soluble protein
D.localizing an "integral membrane" protein that spans a lipid bilayer
E.tightly packing the hydrophobic interior core of a globular protein
An ionic bond between two atoms is formed as a result of the ______________.
(a)sharing of electrons
(b)loss of a neutron from one atom
(c)loss of electrons from both atoms
(d) transfer of electrons from one atom to the other - ANSWER-D. Transfer of electrons
from one atom to others
Which of the following expressions accurately describes the calculation of pH?
Choose the answer that best fits the statement. Cholesterol is an essential component
of biological membranes. Although it is much smaller than the typical phospholipids and
glycoplipids in the membrane, it is a(n) _________ molecule, having both hydrophilic
and hydrophobic regions.
DNA and RNA are different. Which of the following is true of DNA but not true of RNA?
(a)It contains uracil
(b)It contains thymine
(c)It is single stranded
(d)It has 5′-to-3′ directionality. - ANSWER-(b)It contains thymine
Which of the following statements about amino acids is true?
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