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提问人：网友anonymity 发布时间：2022-01-07

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Which ofthe following statement about the thermal conductivity is NOT correct？ A) Thermal conductiv

Which ofthe following statement about the thermal conductivity is NOT correct？

A) Thermal conductivity ofmaterials has a varied relationship to temperature.

B) Oriented polymers have much lower conductivities than unoriented polymers.

C) Incorporation of element to metals reduces the thermal conductivity.

D) Metals have comparatively high thermal conductivities while polymers have rather low values.

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An important market change affecting manufacturer sales forces is that channel members are becoming more powerful.

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第2题

Which of the following statements about articulation istrue?

A．Articulation and pronunciation are identical.

B．Most of the time,poor articulation is caused by laziness.

C．Sloppy articulation is the failure to form particular speech sounds crisply and distinctly.

D．Speakers should avoid careless blending of two short words such as saying “lemme” instead of “let m

E．”

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第3题

10. Which of the following is NOT supposed to be done by self-motivated employees?

A、Cultivating a hobby.

B、Overworking at weekends.

C、Looking for motivators.

D、Renewing goals.

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第4题

When [S]=2Km, the velocity of an enzyme catalyzed reaction equals to

A、Vmax

B、2/3Vmax

C、3/2Vmax

D、2Vmax

E、1/2Vmax

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第5题

The effect of temperature on the rate of enzymatic reaction is

A、When the temperature rises, the reaction rate increases, which is exactly the same as that of ordinary catalysts.

B、Low temperature may denature the most enzymes.

C、The optimum temperature is the characteristic constant of enzyme and is not related to the reaction time.

D、The optimum temperature is not the characteristic constant of enzyme. The longer the reaction time, the lower the optimum temperature.

E、All enzymes have the same optimum temperature.

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第6题

The inhibitory effect of organophosphorus insecticide (有机磷杀虫剂) on cholinesterase (胆碱酯酶) belongs to

A、Reversible inhibition

B、Competitive inhibition

C、Noncompetitive inhibition

D、Uncompetitive inhibition

E、Irreversible inhibition

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第7题

Which of the following is the reversible inhibitor

A、organophosphorous compound 有机磷化合物

B、organic mercury compound 有机汞化合物

C、organoarsenic compound 有机砷化合物

D、cyanide 氰化物

E、sulfonamides 磺胺类药物

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第8题

Competitive reversible inhibitors of enzyme can make

A、Vmax decreases, Km decreases

B、Vmax increases, Km increases

C、Vmax remains unchange, Km increases

D、Vmax remains unchange, Km decreases

E、Vmax decreases, Km increases

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第9题

About the statements on allosteric enzyme and allosteric regulation, the correct is

A、All allosteric enzymes have a regulatory subunit and a catalytic subunit.

B、The kinetic characteristics of allosteric enzyme are S-shaped curve rather than rectangular hyperbola.

C、The mechanism of allosteric activation is the same as that of enzyme activator.

D、Sulfonamides (磺胺类药物) work by allosteric inhibition.

E、It is an important way to rapidly regulate the enzyme content.

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第10题

The most common covalent modification of enzyme is

A、Phosphorylation/Dephosphorylation

B、Adenylation/Deadenylation

C、Methylation/Demethylation

D、Acetylation/Deacetylation

E、-SH / -S-S-

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