The _________________ conducts impulses from the AV node to branches which lead
to the Purkinje fibers.
A.AV valve
B.ventricular septum
C.AV bundle
D.SA node
What is produced when two diiodotyrosine molecules couple togther?
A. triiodothyronine
B. tetriodothyronine
C. thyroxine
D. Both tetraiodotyronine and thyroxine are correct.
How many amino acids are present for a polypeptide chain to be called a protein?
A.3
B.30
C.50
D.100
Action potential transmission in the PNS is decreased if which cells are damaged?
A. astrocytes
B. microglia
C. oligodendrocytes
D. Schwann cells
The pyramidal tracts include the __________ and _____________ tracts.
A.rubrospinal, lateral corticospinal
B.reticulospinal, ventral corticospinal
C.ventral corticospinal, lateral corticospinal
D.rubrospinal, reticulospinal
What molecule is used to produce lymphokine-activated killer cells to treat some types
of cancer?
A.interleukin-2
B.interleukin-1
C.interleukin-4
D.G-CSF
Which of the following is NOT a main substrate for gluconeogenesis?
A. lactic acid
B. glycerol
C. pyruvic acid
D. alanine
The __________ dopamine system may be involved in emotional reward and drug
addiction.
A. nigrostriatal
B. mesolimbic
C. amygdala
D. dentate
DNA replication is
A. conservative.
B. semiconservative.
C. dispersive.
D. both semiconservative and dispersive.
Keto-acids are produced from amino acids through
A. transamination.
B. oxidative deamination.
C. beta-oxidation.
D. phosphorylation.
Genetic screening of newborns using only a drop of blood can determine which of the
following genetic disorders?
A. hypothyroidism
B. cystic fibrosis
C. sickle cell anemia
D. All of the choices are correct.
What structures carry urine from the kidneys to the urinary bladder?
A.ureters
B.urethras
C.calyces
D.pyramids
Which of the following is true of atherosclerosis?
A. It is most likely an inflammatory disease.
B. Blood C-reactive protein levels are better predictors than LDL cholesterol levels.
C. Antioxidants may be used to prevent or treat it.
D. All apply
Ovarian granulosa cells synthesize estradiol which is produced by the theca interna
cells from
A.FSH.
B.progesterone.
C.testosterone.
D.LH.
What molecules pass information from the polar regulatory molecule receptor to
activate the enzymes that produce cAMP?
A. paracrines
B. G-proteins
C. GTP
D. None apply.
Which of the following is NOT true of siRNA?
A. It can silence up to 200 different mRNAs.
B. It is short and double-stranded.
C. It is processed by an enzyme called Dicer.
D. It may be used to genetically suppress genes involved in disease.
How much of the total body water is generally found in the blood plasma?
A.67%
B.33%
C.26.3%
D.6.7%
The ____ limb of the loop of Henle is impermeable to salt.
A. ascending
B. descending
C. both limbs
D. neither
Having the APOE4 gene increases the likelihood of developing
A. Huntingdon’s disease.
B. Alzheimer’s disease.
C. Parkinson’s disease.
D. amnesia.
Destroying the ciliary body would prevent the _____________ from receiving
nutrients.
A.cornea sclera
B.iris
C.pupil
D.lens and cornea
What is the purpose of white fat?
A. thermogenesis
B. provide blood-borne energy carriers
C. provide an ATP source for newborns
D. All apply.
Which of the following is NOT a circulating energy substrate?
A.glucose
B.glycogen
C.fatty acids
D.amino acids
Vasodilation is induced by all of the following EXCEPT
A.increased tissue carbon dioxide.
B.decreased tissue metabolism.
C.decreased tissue oxygen.
D.increased extracellular K+.
What is the order that filtrate must pass through to the glomerular capsule?
A.podocytes of glomerular epithelium, glomerular basement membrane, capillary
fenestrae
B.capillary fenestrae, glomerular basement membrane, podocytes of visceral glomerular
epithelium
C.glomerular basement membrane, capillary fenestrae, podocytes of visceral glomerular
epithelium
D.capillary fenestrae, podocytes of visceral glomerular epithelium, glomerular
basement membrane
How many genes does it appear that humans have?
A. 25,000
B. 100,000
C. 3 million
D. 3 billion
What muscle structural and functional unit runs from Z disc to Z disc?
A. A band
B. I band
C. sarcomere
D. myofibril
The mechanism that allows many Na+ ions to move into the axon is
A. negative feedback.
B. positive feedback.
C. equilibrium feedback.
D. None of the choices are correct.
A(n) _____________ is an abnormal growth of the thyroid gland due to an iodine
deficiency.
A.tumor
B.goiter
C.abscss
D.keloid
Dehydration synthesis reactions are catalyzed by
A.dehydrogenases.
B.hydrolases.
C.isomerases.
D.synthases.
What role do outer hair cells play in the transmission of sound?
A. They dampen strong vibrations from very loud sounds.
B. They bend and depolarize with specific wavelengths of sound waves.
C. They amplify softer sound and sharpen pitch perception.
D. All apply.