Question

1. Enzymes can have multiple forms with different substrate efficiencies without dramatic changes in general overall polypeptide form. These enzymes are referred to as:

a. allosteric enzymes

b. isozymes

c. ribozymes

d.multizymes

e. none of the above

2. The combination of the lagging strand, Helicase and a primase creates a complex termed:

a. a topoisomerase

b. none of the above

c. a primasome

d. a replisome

e. a holoenzyme

3. In eukaryotic translation, translation of a newly formed mRNA strand typically begins prior to the completion of the transcriptional process and requires the 40s ribosomal subunit and a f-met-tRNA. evaluate each phrase carefully

a. false, false

b.false, true

c. true, true,

d. true, false

Answer 1

1 isozymes.

Isozymes are enzymes having different amino acid sequence but catalyze the same chemical reaction. For example cytochrome p 450 isoenzyme plays role in metabolism as well as sreroidogenesis.

2 d replisome

Replisome is molecular machine that carries out replication of DNA. It is composed of 2 replicative polymerase complex. One that forms the lagging strand and one forms leading strand and consists of helicases and primases.

3 c true, true.

Translation of mrna in eukaryotes begin before the end of transcription. Thus happens because in eukaryotic nucleus there is a distinct compartment that allows for transcription thuthus allowing translation to proceed. Translation requires the presence of 40 s subunit of ribosome that is the samll subunit and f met tran