Murphy Rutgers BioChem Exam 3
UPDATED ACTUAL Exam Questions and
CORRECT Answers
What catalyzes DNA synthesis?
DNA polymerase
Replication fork
Primer
dNTPs - CORRECT ANSWER -DNA polymerase
Which part of a deoxynucleoside triphosphate (dNTP) molecule provides the energy for DNA
synthesis?
Free 3' hydroxyl (-OH) group
Phosphate groups
Base
Sugar - CORRECT ANSWER -Phosphate groups
Which of the following enzymes is important for relieving the tension in a helix as it unwinds
during DNA synthesis?
Topoisomerase
Helicase
Single-stranded binding proteins
Ligase - CORRECT ANSWER -Topoisomerase
The new DNA strand that grows continuously in the 5' to 3' direction is called the - CORRECT
ANSWER -leading strand
During DNA replication, an open section of DNA, in which a DNA polymerase can replicate
DNA, is called a - CORRECT ANSWER -replication fork
, Which of the following statements about hormones are correct?
1. Hormones can be peptides, steroids, or amino acid derivatives.
2. Hormones can stimulate the synthesis of target proteins through the activation of specific
genes.
3. Hormones can directly activate or inhibit enzymes through the action of signal molecules.
4. Hormones can increase the cellular uptake of metabolites. - CORRECT ANSWER -1, 2,
4
Which of the following are characteristics of G protein-coupled receptors (GPCRs)?
1. They typically have seven transmembrane domains that are embedded in the cell membrane.
2. They carry hydrophilic portions of protein that extend into the extracellular matrix as well as
the cytosol.
2. The receptor region is located on the extracellular portion of the protein.
4. Most work in concert with G proteins. - CORRECT ANSWER -All
_____ catalyzes the production of _____, which then opens an ion channel that releases _____
into the cell's cytoplasm.
Adenylyl cyclase ... cyclic AMP ... Ca2+
Protein kinase ... PIP2 ... Na+
Phospholipase C ... IP3 .... Ca2+
Adenylyl cyclase ... IP3 .... Ca2+
Phospholipase C ... cyclic AMP ... Ca2+ - CORRECT ANSWER -Phospholipase C ... IP3
.... Ca2+
The minor groove contains less information about the identity of base pairs than the major
groove because of the
geometry of base pairing and structure of ribose.
glycosidic bond angles and structure of pyrimidine bases.
glycosidic bond angles and geometry of base pairings.
UPDATED ACTUAL Exam Questions and
CORRECT Answers
What catalyzes DNA synthesis?
DNA polymerase
Replication fork
Primer
dNTPs - CORRECT ANSWER -DNA polymerase
Which part of a deoxynucleoside triphosphate (dNTP) molecule provides the energy for DNA
synthesis?
Free 3' hydroxyl (-OH) group
Phosphate groups
Base
Sugar - CORRECT ANSWER -Phosphate groups
Which of the following enzymes is important for relieving the tension in a helix as it unwinds
during DNA synthesis?
Topoisomerase
Helicase
Single-stranded binding proteins
Ligase - CORRECT ANSWER -Topoisomerase
The new DNA strand that grows continuously in the 5' to 3' direction is called the - CORRECT
ANSWER -leading strand
During DNA replication, an open section of DNA, in which a DNA polymerase can replicate
DNA, is called a - CORRECT ANSWER -replication fork
, Which of the following statements about hormones are correct?
1. Hormones can be peptides, steroids, or amino acid derivatives.
2. Hormones can stimulate the synthesis of target proteins through the activation of specific
genes.
3. Hormones can directly activate or inhibit enzymes through the action of signal molecules.
4. Hormones can increase the cellular uptake of metabolites. - CORRECT ANSWER -1, 2,
4
Which of the following are characteristics of G protein-coupled receptors (GPCRs)?
1. They typically have seven transmembrane domains that are embedded in the cell membrane.
2. They carry hydrophilic portions of protein that extend into the extracellular matrix as well as
the cytosol.
2. The receptor region is located on the extracellular portion of the protein.
4. Most work in concert with G proteins. - CORRECT ANSWER -All
_____ catalyzes the production of _____, which then opens an ion channel that releases _____
into the cell's cytoplasm.
Adenylyl cyclase ... cyclic AMP ... Ca2+
Protein kinase ... PIP2 ... Na+
Phospholipase C ... IP3 .... Ca2+
Adenylyl cyclase ... IP3 .... Ca2+
Phospholipase C ... cyclic AMP ... Ca2+ - CORRECT ANSWER -Phospholipase C ... IP3
.... Ca2+
The minor groove contains less information about the identity of base pairs than the major
groove because of the
geometry of base pairing and structure of ribose.
glycosidic bond angles and structure of pyrimidine bases.
glycosidic bond angles and geometry of base pairings.
