TLS Online TPP Program

#Question id: 27372


Which of the following RNAs can induce gene silencing?

#Section 3: Genetics, Cellular and Molecular Biology
  1. miRNA

  2. snoRNA
  3. ssRNA
  4. ncRNA

More Questions
TLS Online TPP Program

#Question id: 634

#Section 2: General Biology

An enzyme has a Vmax of 50 micromol product formed (minute x mg protein)-1 and a Km of 10 microM for the substrate. When a reaction mixture contains the enzyme and 5 microM substrate, which of the following percentages of the maximum velocity will be closest to the initial reaction rate?

TLS Online TPP Program

#Question id: 635

#Section 2: General Biology

The enymatic rate constant (kcat/Km) of orotidine 5ʹ-phosphate decarboxylase is 6 x 107 M-1s-1 and the nonenzymatic rate constant (kn) is 3 x 10-16 s-1.  What is the value of the enzymeʹs catalytic proficiency?

TLS Online TPP Program

#Question id: 636

#Section 2: General Biology

DNA polymerase contains a lysine residue that is important for binding to DNA. Mutations were found that converted this lysine to either glutamate, glycine, valine, or arginine. Which mutations would be predicted to be the most and least harmful to the ability of the enzyme to bind DNA?

Most

Least

(A)

Valine

Aspartate

(B)

Glycine

Arginine

(C)

Arginine

Glycine

(D)

Glutamate

Arginine

TLS Online TPP Program

#Question id: 638

#Section 2: General Biology

Match the following class of enzymes with them

Enzyme

Class of enzyme

A. Hexokinase

1

B. Phosphoglucoisomerase

2

C. Glyceraldehyde 3-phosphate dehydrogenase

3

D. Phosphoglycerate mutase

4

E. Enolase

5

F. Aldolase

TLS Online TPP Program

#Question id: 639

#Section 2: General Biology

Match the coenzymes in column I enzymes to class of enzymes in column II

A. Phosphofructokinase

1. Redox reaction

B. Enolase

2. Phosphoryl shift

C. Phosphoglycerate mutase

3. Dehydration

D. Glyceraldehyde 3 Phosphate dehydrogenase

4. Phosphoryl transfer

TLS Online TPP Program

#Question id: 640

#Section 2: General Biology

The data in the table above were collected for an enzyme-catalyzed reaction. The Km for this enzyme is approximately