Biochemistry Midterm (Units 1 & 2)
Exam Questions and Answers 100%
Pass | Graded A+
Troponin - A 55-year-old male is brought to the emergency department
with a chief concern of chest pain and tingling in his left arm. Elevation of
which of the following enzymes in circulation would be most ind...
Troponin - ✔✔A 55-year-old male is brought to the emergency department
with a chief concern of chest pain and tingling in his left arm. Elevation of
which of the following enzymes in circulation would be most indicative of a
myocardial infarction?
- Lipase
- Lactate dehydrogenase
- Amylase
- Troponin
An arrangement of β-strands connected by α-helices (βαβαβ) -
✔✔Domains are common structural elements that retain a particular
function within the protein. Which of the following is an example of a protein
domain?
,- A single α-helix
- A prosthetic group - such as heme
- An arrangement of β-strands connected by α-helices (βαβαβ)
- Irregular coils and loops
Monomeric, tetrameric - ✔✔Myoglobin is a _____ protein. Hemoglobin is a
_____ protein.
- Monomeric, tetrameric
- Monomeric, monomeric
- Tetrameric, tetrameric
- Tetrameric, monomeric
Amylase - ✔✔A 22-year old female presents to the emergency room with
acute abdominal pain. She indicates the pain came on rapidly in her mid-
abdominal region. She has vomited several times over the last 4 hours. A
diagnosis of acute pancreatitis is made. Elevation of which of the following
serum enzymes would be consistent with this diagnosis?
- Amylase
- Troponin
- Creatine kinase
,- Lactate dehydrogenase
NADH - ✔✔Which of the following cofactors or coenzymes would not
typically participate in an activation transfer reaction?
- Pyridoxal phosphate (PLP)
- Thiamine pyrophosphate
- Coenzyme A
- NADH
- Biotin
Binding the enzyme, and keeping it in the "T" conformation - ✔✔Allosteric
inhibitors of hemoglobin will decrease enzyme activity (oxygen binding)
through which of the following mechanisms?
- Binding the enzyme, and keeping it in the "T" conformation
- Binding the enzyme, and keeping it in the "R" conformation
- Binding the enzyme and enhancing Vmax
- Binding the enzyme in "T" conformation and displacing an activator
Secondary structure of the protein - ✔✔An α-helical arrangement of amino
acids is considered to be part of what level of protein structure?
, - Secondary structure of the protein
- Tertiary structure of the protein
- Quaternary structure of the protein
- Primary structure of the protein
Valine - ✔✔Covalent catalysis is used by many enzymes to cleave peptide
bonds. Which of the following amino acids would not facilitate this type of
catalysis? (Think of the structure of the R-group of these amino acids)
- Histidine
- Valine
- Cysteine
- Serine
Water - ✔✔Phosphorylation by a kinase requires each of the following
except:
- ATP
- Threonine
- Mg2+
- Water
- Serine
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