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【单选题】
An in-flight engine compartment fire is usually caused by a failure that allows _____ substances such as fuel, oil, or hydraulic fluid to come in contact with a hot surface.A.
toxic
B.
explosive
C.
radioactive
D.
flammable
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【简答题】已知0＜α＜β＜γ≤2π，且cosα+cosβ+cosγ=0，sinα+sinβ+sinγ=0，求cos（β-α）的值，并求β-α．
【单选题】Pathway regulation can occur via the expression of tissue-specific isozymes. Glucose metabolism differs in red blood cells and liver in that red blood cells need to metabolize glucose, whereas the liv...
A.
The Km of hexokinase I is higher than the Km of glucokinase.
B.
The Km of hexokinase I is lower than the Km of glucokinase.
C.
The Km of hexokinase I is the same as the Km of glucokinase
D.
Hexokinase I is found in liver.
E.
Glucokinase is found in red blood cells.
【单选题】Akt, also called protein kinase B (PKB), promotes the growth and survival of many cell types, often by inactivating the signaling proteins it phosphorylates. For example, Akt phosphorylates and inacti...
A.
Bad (Bcl-2-associated agonist of cell death )
B.
Bcl-2
C.
Bax
D.
Bcl-xl
【简答题】The ultraviolet radiation in sunlight is also damaging to DNA; it promotes covalent linkage between two adjacent pyrimidine bases, forming, for example, the _____________.
【单选题】When blood glucose levels decrease, hormone "A" is secreted. Based on this information, hormone A is controlled by
A.
changes in the level of a chemical in the blood.
B.
direct stimulation by the nervous system.
C.
stimulation by a hormone released from another endocrine gland.
D.
a hypothalamic releasing factor.
【简答题】Glucagonraises blood glucose levels by stimulating the to metabolize glycogen into glucose molecules and to release glucose into the blood.
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