Which of the following is the central player in chromosome segregation?

a. Interpolar microtubules

b. Astral microtubules

c. K-fibers

#Question id: 10791

#Unit 6. System Physiology – Plant

Following are certain statements regarding furanocoumarins;

 a) furanocoumarins have an attached furan ring

 b) These compounds are toxic until they are activated by sunlight in the ultraviolet A (UV-A) region (320–400 nm)  

 c) Light activated furanocoumarins can insert themselves into the double helix of DNA and bind to the pyrimidine bases, thus blocking transcription and repair and leading eventually to cell death   

 d) Phototoxic furanocoumarins are especially abundant in members of the Umbelliferae family, including celery, parsnip, and parsley.

 Which of the following combination from the above statements is correct?

#Question id: 11736

#Unit 6. System Physiology – Plant

Many plant tissues contain the enzyme cytokinin oxidase, which cleaves the side chain, except

#Question id: 3760

#Unit 3. Fundamental Processes

In E. coli, what is the function of DNA polymerase III?

#Question id: 10583

#Unit 10. Ecological Principles

Suppose you discovered a new species about which youknow only two facts: it is small sized (<10 cm) and short lived (<20 days). Which of the following strategies is most likely to be true for this species?

#Question id: 1521

#Unit 4. Cell Communication and Cell Signaling

we examine how the deregulation of growth-promoting and growth-inhibiting signaling pathways contributes to tumorigenesis. Mutations-

A. A mutation that alters a single amino acid (valine to glutamine) in the transmembrane region of the HER2 receptor

B. A deletion that causes loss of the extracellular ligand-binding domain in the EGF receptor Results-

i. dimerization of the receptor, even in the absence of the normal EGF-related ligand, transforming it into the oncoprotein, a constitutively active kinase

ii. to constitutive activation of the kinase activity of the resulting oncoprotein

iii. no dimerization, even in the presence of the normal EGF-related ligand, repression of kinase activity

which of the following results are displayed after these mutations?