Practice Questions

TLS Online TPP Program

#Question id: 807

Which of the following forces can stabilize a normal DNA double-helix?

#Unit 1. Molecules and their Interaction Relevant to Biology

Base-stacking is a non-covalent interaction that occurs between the relatively hydrophobic bases in the interior of the helix.
Base-pairing is a non-covalent interaction that occurs between adjacent bases in the same strand of the DNA molecule.
The hydrophilic sugar-phosphate groups are on the exterior of the helix where they can interact with each other.
The deoxyribose rings form N-glycosidic bonds with the phosphate groups that link neighboring nucleotides.

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TLS Online TPP Program

#Question id: 1264

#Unit 4. Cell Communication and Cell Signaling

Desmosomes

TLS Online TPP Program

#Question id: 23279

#Unit 13. Methods in Biology

What will be the value of D if sin angle is 90o and oil immersion is used at λ=700?

TLS Online TPP Program

#Question id: 11909

#Unit 8. Inheritance Biology

In the birds, butterflies and some reptiles, sex is still chromosomal, but the male that possesses two identical sex chromosome while the female has two different sex chromosome, in this case which one is determining sex?

TLS Online TPP Program

#Question id: 2260

#Unit 2. Cellular Organization

The term "nuclear envelope" is more correct than the term "nuclear membrane" because

TLS Online TPP Program

#Question id: 7759

#Unit 5. Developmental Biology

WRKY plant-specific group of transcription factors that play important role in many plant metabolic and developmental processes such as;

a) It contain a 30 amino acid region named for the conserved amino acid sequence WRKYGQK in its N-terminal domain

b) It is an important regulators of plant–pathogen interactions as well as senescence

c) WRKY53 is involved in the regulation of dark-induced leaf senescence

d) In Arabidopsis, leaf senescence is delayed in knockout mutants of the WRKY53 gene