Practice Questions

TLS Online TPP Program

#Question id: 3830

Why is DNA damage in skin cells from exposure to excessive UV light not completely reversed by photoreactivation?

#Unit 3. Fundamental Processes

DNA photolyase in humans is activated only under conditions of heat shock.
Humans lack a photoreactivation repair mechanism.
The presence of histones greatly slows photoreactivation, thus humans depend primarily on other forms of DNA repair.
Photoreactivation is specific for the removal of thymine dimers. Thymine dimers do not form in human DNA.

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TLS Online TPP Program

#Question id: 15749

#Unit 5. Developmental Biology

In Drosophila, if there is one X chromosome and two sets of autosomes then the fly is:

TLS Online TPP Program

#Question id: 15750

#Unit 5. Developmental Biology

Drosophila, if there is three X chromosome and two sets of autosomes then the fly is:

TLS Online TPP Program

#Question id: 15751

#Unit 12. Applied Biology

Plants through the fusion of protoplasts of two different plant species/varieties is called

TLS Online TPP Program

#Question id: 15752

#Unit 12. Applied Biology

Match the following

Column I Column II

I. Auxin a. Somatic embryogenesis

II. Cytokinin b. Root

III. GA3 c. Continued growth

IV. Abscisic acid d. Shoot

TLS Online TPP Program

#Question id: 15753

#Unit 12. Applied Biology

Match the following:

Column I Column II

I Alkaloids P. Digoxigenin

II Terpenoids Q. Menthol

III Quinones R. Anthocyanins

IV Steroids S. Anthraquinones

TLS Online TPP Program

#Question id: 15754

#Unit 12. Applied Biology

Match the following:

Column I Column II

I Alkaloids P. Digoxigenin

II Terpenoids Q. Menthol

III Quinones R. Anthocyanins

IV Steroids S. Anthraquinones