Practice Questions

TLS Online TPP Program

#Question id: 803

A single-stranded DNA molecule contains 40 nucleotides and has the sequence 5’-(GA)20-3’. When this single strand binds to a complementary DNA strand to form a B-DNA structure,

#Unit 1. Molecules and their Interaction Relevant to Biology

half the base-pairs will be A-G pairs and half will be C-T pairs.
each base will form at least two hydrogen bonds with a base in the opposite strand.
the two strands will form an antiparallel left-handed helix with 12 base pairs per turn.
there will be covalent phosphodiester bonds between the two strands.

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TLS Online TPP Program

#Question id: 29110

#Unit 8. Inheritance Biology

When two parents heterozygous for albinism mate (Aa X Aa), the probability

of their having a child with albinism (aa) is 1/4 and the probability of having a child with normal pigmentation (AA or Aa) is 3/4 . What is the probability of this couple having 5 children, two with albinism and three with normal pigmentation?

TLS Online TPP Program

#Question id: 29055

#Unit 10. Ecological Principles

Which of the following statements is correct about biogeochemical cycling?

TLS Online TPP Program

#Question id: 28586

#Unit 2. Cellular Organization

Cyclin-dependent kinases (CDK) belongs to which family of kinases?

TLS Online TPP Program

#Question id: 3969

#Unit 3. Fundamental Processes

The longevity of mRNA is related to:

TLS Online TPP Program

#Question id: 2023

#Unit 4. Cell Communication and Cell Signaling

Which of the following is a pathway that would lead to the activation of cytotoxic T cells?