Which of the following signalling pathway that perform functions to regulate the actin and microtubule cytoskeleton, & influences cell shape and behaviour?

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#Question id: 1687

#Unit 4. Cell Communication and Cell Signaling

A discontinuous antigen epitope is:

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#Question id: 28541

#Unit 5. Developmental Biology

Following statements is related to the figure that required for the maintenance of stem cell number such as;

I-As stem cell number decreases, the level of CLV3 is reduced

II-an increase in the number of stem cells promotes transcription of CLV3

III-a small peptide binds to the receptor and supresses the expression of WUS

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#Question id: 23678

#Unit 13. Methods in Biology

Which component is not necessary for a PCR experiment?

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#Question id: 732

#Unit 1. Molecules and their Interaction Relevant to Biology

Ramachandran plots can help increase the accuracy of models derived from x-ray crystallography data. The plot below was created by measuring phi, and psi for each amino acid residue in a 2.2 A resolution crystal structure. In the plot, which excludes Gly and Pro residues, selected residues (dots) are numbered 1 through 5.

Which of the following statements can be correctly stated for this plot in reference to selected residues?

A. Residues 1 and 3 are in either B sheets

B. residue 2 is in a right-handed a helix, and residue 4 is in a left-handed a helix.

C. If residue 5 were Gly, it might be in an acceptable position in the plot

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#Question id: 4464

#Unit 3. Fundamental Processes

Role of Gre factor;