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【多选题】
Active reabsorption of renal tubules（ ）
A.
H2O
B.
K+
C.
Glucose and amino acids
D.
Na+
E.
Urea and H+
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参考解析：
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举一反三
【多选题】The 1:1 transmission of excitation at the nerve-muscle junction is due to（ ）
A.
The end plate potentials generated are large enough
B.
High excitability of endplate membrane
C.
The absolute refractory period of endplate membrane is long
D.
A nerve impulse releases a sufficient number of transmitters from the nerve endings
E.
Ach was hydrolyzed by cholinesterase in the joint clearance in time
【单选题】Which component of the prokaryote RNA polymerase holoenzyme is involved in recognizing promoters specific to certain types of genes? （ ）
A.
α
B.
β
C.
σ
D.
β’
【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
【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