In the case of the French flag model. we assume a source of morphogen at one end and a sink at the other and that the concentrations of morphogen at both ends are kept constant but are different from each other. If the cells can respond to threshold concentrations of the morphogen, Thresholds can represent the

TLS Online TPP Program

#Question id: 14490

#Unit 13. Methods in Biology

In a single throw of two dice find the probability that neither a doublet (same number on the both dice) nor a total of 9 will appear.

TLS Online TPP Program

#Question id: 3824

#Unit 3. Fundamental Processes

State whether the following statements is true/false regarding DNA replication.

1. The polymerization of DNA is essentially irreversible due to the hydrolysis of pyrophosphate.

2. On average about twenty errors are made during each replication of the human genome.

3. DNA polymerase I possesses 5ʹ → 3ʹ exonuclease activity.

4. All DNA ligase enzymes use ATP as a cosubstrate.

5. The purpose of SSB is to prevent single-stranded DNA from folding back on itself to form double-helical regions.

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#Question id: 31135

#Unit 2. Cellular Organization

Which of the following proteins not included in N-Myristoyl–anchored proteins ?

TLS Online TPP Program

#Question id: 781

#Unit 1. Molecules and their Interaction Relevant to Biology

siRNAs are involved in which of the following?

TLS Online TPP Program

#Question id: 33478

#Unit 2. Cellular Organization

Find true and false statements

A. Comparisons of related genes in different species show that the sequences of the corresponding exons are usually conserved

B. when two genes are related, the relationship between their exons is closer than the relationship between their introns.

C. The sequences of the introns are much less similar.

D. Introns evolve much more rapidly than exons because of the lack of selective pressure to produce a polypeptide with a useful sequence.