Biology - Comprehensive Mock Test 55

Question 541 Easy

Ribozyme is ?

A) RNA without phosphate B) RNA with sugar C) RNA with enzyme activity D) RNA with extra phosphate

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Question 542 Easy

Restriction endonucleases are enzymes which ?

A) Remove nucleotides from the ends of the DNA molecule B) Make cuts at specific positions within the DNA molecule C) Recognize a specific nucleotide sequence for binding of DNA ligase D) Restrict the action of the enzyme DNA polymerase

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Question 543 Easy

Restriction endonuclease is employed for ?

A) Cutting RNA B) Cutting single stranded DNA C) Cutting double stranded DNA D) Joining strands of DNA

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Question 544 Easy

Most of the members of vitamin B complex act as ?

A) Cofactor B) Coenzyme C) Prosthetic group D) Apoenzyme

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Question 545 Medium

Many enzymes are secreted in inactive form to protect ?

A) Cell Membrane B) Mitochondria C) Cell proteins D) Cell DNA

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Question 546 Hard

Beadle and Tatum showed that each kind of mutant bread mould they studied lacked a specific enzyme. Their experiments demonstrated that ?

A) Cells need specific enzymes in order to function B) Genes are made of DNA C) Genes carry information for making proteins D) Enzymes are required to repair damaged DNA information

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Question 547 Medium

The first enzyme to be purified and crystallized was ?

A) Urease B) Diastase C) Insulin D) Zymase

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Question 548 Easy

NADP+ is ?

A) Enzyme activator B) Ion carrier C) Hydrogen acceptor D) Electron acceptor

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Question 549 Medium

One common example of feedback inhibition would be ______?

A) Allosteric inhibition of hexokinase by glucose-6-phosphate B) Reaction between succinic dehydrogenase and succinic acid C) Cyanide and cytochrome reaction D) Sulfa drugs and folic acid synthesis in bacteria

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Question 550 Medium

Km value of enzyme is substrate concentration at ?

A) 1/2 V max B) 2 V max C) 1/4 V max D) 4 V max

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