中国大学MOOC慕课爱课程(3)--试卷(英语)及答案网课刷课

武汉大学生命科学学院

2012－2013学年度第一学期期末考试

《生物化学》试卷（A卷）正确答案

C o l l e g e o f L i f e S c i e n c e s,W u h a n U n i v e r s i t y

B i o c h e m i s t r y F i n a l E x a m

(2013.1.9)

Name__________Student No.Major__________Score__________ 1．Multiple choice (1 point each, 25 points total)

__1)According to the fluid mosaic model of cell membranes, which type of molecule spans the membrane from its inner to outer surface?

A.Cholesterol

B.Phospholipids

C.Protein

D.triacylglycerol

__2)If a mutant enzyme is found to have the same K m but a lower V max, it is most likely that energy of the transition state

A.has remained the same

B.has decreased

C.has increased

D.has decreased substrate binding

__3)In an erythrocyte undergoing glycolysis, a sudden increase in the concentration of the following would lead to the increase of glycolysis EXCEPT

A.[AMP]

B.[Citrate]

C.[fructose-1,6-bisphosphate]

D.[fructose-2,6-bisphosphate]

__4). Acetyl groups (e.g. for lipid biosynthesis) are transported out of the mitochondria indirectly using

A.acetyl carnitine.

B.acetyl phosphate.

C.citrate.

D.malate.

__5). The source of oxygen for O2 production during photosynthesis by higher plants is

A. CO2

B. HCO3 -

C. H2O

D. ATP

__6). HMG-CoA reductase is the rate limiting enzyme in synthesis of:

A.low molecular weight triglycerides

B.cholesterol

C.High molecular weight triglycerides

D.Chylomicrons

__7). The final electron acceptor in the electron transport chain is

A.FAD

B.NAD+

C.CoQ

D.Oxygen

__8). Absorbed lipid is transported away from the gut mucosal cells in the form of

A.VLDL

B.LDL

C.HDL

D.Chylomycrons

__9). During DNA replication the negative supercoiling of the bacterial chromosome is maintained by the action of

A.DNA gyrase.

B.DnaB helicase.

C.DNA ligase.

D.Primase.

__10). Which of the following is true?

A.Liquid and solid water have the same number of hydrogen bonds per molecule of

water

B.Liquid water has more hydrogen bonds per molecule than does solid water

C.Solid water has more hydrogen bonds per molecule than does liquid water

D.Hydrogen bonding is a major factor in the structure of gaseous water

__11). Electrons from complex I are transferred directly to which of the

following electron transport components?

plex II

plex III

C.cytochrome c

D.ubiquinone

12). Which diagram best depicts the state immediately following peptide bond formation between the initiating met and the second amino acid (aa2) of the peptide prior to the first translocation step (movement of the ribosome by one codon toward the 3' end)?