1 important components of some enzymes are cofactors They are: a-organic compone

Question

1 important components of some enzymes are cofactors They are:

a-organic components                                          b-metallic ions                                                   

c- active sites                                                         d- substrates

E- ribozymes

2- The RNA molecules that carry the genetic information from DNA to the ribosomes for protein synthesis are called

a-ribosomal RNA                                                       b-messenger RNA

c- Transfer RNA                                                         d-primer RNA

E- ribozymes

3-The most likely place where the endoezymes of glycolysis are located is in the

a-mitochondria                                                                b-cell membrane

c- nucleus                                                                         d- cytoplasm

E- outside the cell

4-Regarding the structure of an Operon the non transcribed non copied region of DNA to which the repressor binds to inhibit transcription is called the

A-promoter                                                                           b-operator

c- operon                                                                              d- exon

e -Intron

5- What is not true about enzymes?

a-They convert the substrate into product                                                b- They lower the activation energy

c- They produce more product than without the enzyme                       D- They are biological catalysts

6-How do enzymes recognize their substrates?

A-     By their shape

B-      By their size

C-      By their charge

D-     By their cell location

E-      By their size shape and charge

7-The RNA molecules that carry amino acids to the ribosomes during proteins synthesis are called

   A- ribosomal RNA                                                  c-transfer RNA

8-Which is incorrect about inducible operons?

A.      They are often for catabolic pathways

B.      They are normally turned off

C.      They are turned on by the substrate of the enzyme

D.      They include the lac operon

E.       All are correct

9-what is the function of the co-factor portion of the enzyme?

a.       To assist in binding the substrate

b.      To aid in the transfer of the electrons

c.       To aid in releasing the product of the reaction

d.      To help bind ATP

e.      None of the above

10- In this reaction from glycolysis how is ATP formed?

Phosphoenol pyruvate +ADP ----------à Pyruvate + ATP

a-      Oxidative phosphorylation

b-      Fermentation

c-       Preparation for the Kreb’s cycle

d-      Kreb’s cycle

e-      Subtrate-level phosphorylation

11- A mutation that changes a normal codon to a codon that codes for a different amino acid is called a(n)

a-deletion                            b-silent mutation           

c-insertion                            d- missense mutati

Explanation / Answer

1) a) organic components. If they are non-organic (like metalions), they are called coenzymes.

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