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【单选题】
Etiology of centripetal obesity（ ）
A.
Excessive glucocorticoid secretion
B.
Lack of protein in food
C.
iodine deficiency in food
D.
Insufficient growth hormone secretion in childhood
E.
Hypothyroidism in childhood
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【多选题】The characteristics of nerve fiber conduction excitation are（ ）
A.
Sum
B.
Bidirectional conduction
C.
Insulation
D.
Fatigue
E.
Structural and functional integrity
【多选题】Factors that can increase myocardial contractility include（ ）
A.
Increased Ca2+ affinity for troponin
B.
reduced ventricular preload
C.
increased catecholamines
D.
Increased myosin ATPase activity
E.
Increased Ca2+ concentration in extracellular fluid
【单选题】We usually call codons contains 5 characteristics, among which the degeneracy of the genetic code means?（ ）
A.
Most amino acids have more than one set of codons
B.
There are many rare bases in the code which translate rare amino acids
C.
A triplet codon can lack or insert a purine or pyrimidine base
D.
At least nine codons apply to more than one amino acid
【单选题】Although mammalian genome is huge, cells can replicate the genome in just a few minutes.Which is the most possible reason?（ ）
A.
RNA polymerases carry out replication
B.
Eukaryotic DNA polymerases are extraordinarily faster than prokaryotes
C.
Hundreds of replication forks work simultaneously
D.
The unique cell cycle
【多选题】The effective glomerular filtration pressure depends on（ ）
A.
Plasma colloid osmotic pressure
B.
Glomerular capillary blood pressure
C.
Whole body arterial blood pressure
D.
Renal intracapsular pressure
E.
Plasma crystal osmotic pressure
【多选题】The binding characteristics of Hb and O2 are（ ）
A.
Fast reaction, reversible, no enzyme catalysis
B.
Affected by PO2
C.
The binding or dissociation curve of Hb and O2 is s-shaped, which is related to allosteric effect of Hb
D.
The combination of Fe2+ and O2 is oxygenation rather than oxidation
E.
One molecule of Hb can bind four molecules of O2
【单选题】Which RNA polymerase transcribes the gene of insulin? （ ）
A.
RNA polymerase I
B.
RNA polymerase III
C.
RNA polymerase IV
D.
RNA polymerase II
【多选题】When cell excitability is reduced, which are correct in the following descriptions（ ）
A.
Upward shift of threshold potential
B.
The threshold intensity increases
C.
Downward shift of threshold potential
D.
The threshold potential and threshold intensity remain unchanged
E.
The threshold intensity decreases
【多选题】The main factors affecting the release of presynaptic membrane transmitters are（ ）
A.
Conduction velocity of the action potential
B.
Number of vesicles that release the transmitter
C.
The amount of Ca2+ entering the anterior membrane
D.
Amplitude of spike
E.
The size of the transmitter vesicle