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【单选题】
Amount of T in RNA is 0.25mol，so amount of A is_____. （ ）
A.
1.00mol
B.
0.5mol
C.
0.25mol
D.
0.75mol
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【多选题】The characteristics of local reactions are that（ ）
A.
Multiple local potential can be superimposed
B.
Conduction shows attenuation
C.
The amplitude is hierarchical
D.
Degrees of varying refractory periods
E.
Independent of stimulus intensity
【多选题】The following statements about neurons are true（ ）
A.
The cell body can transmit information
B.
Dendrites can receive information
C.
Axons transmit information
D.
Neurons can regenerate
E.
Axons can receive information
【单选题】Which of the following hormones is not secreted by adenohypophysis（ ）
A.
Luteinizing hormone
B.
Thyroid stimulating hormone
C.
prolactin
D.
oxytocin
E.
Adrenocorticotropic hormone
【单选题】Which mechanism can explain two strands are synthesized in the opposite direction, in the replication fork?（ ）
A.
semiconservative replication
B.
priming of DNA synthesis
C.
semidiscontinuous replication
D.
bidirectional replication
【多选题】The correct description about decompression reflex is that（ ）
A.
The receptors are located in the carotid sinus and the aortic arch
B.
The efferent nerves are the sympathetic and vagus nerves
C.
Reflexes only result in lower blood pressure
D.
The center is located in the medulla oblongata
E.
The afferent nerves are the aortic and sinus nerves
【多选题】The main factors affecting pulmonary ventilation are （ ）.
A.
Area and thickness of respiratory membrane
B.
Body weight
C.
Breathing rhythm
D.
Vital capacity
E.
Alveolar ventilation/blood flow ratio
【多选题】Active reabsorption of renal tubules（ ）
A.
H2O
B.
K+
C.
Glucose and amino acids
D.
Na+
E.
Urea and H+
【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