The cell membranes of psychrophilic microorganisms have high levels of _______ and remain semifluid when cold.

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#Question id: 12181

#Unit 2. Cellular Organization

Following statements are regarding to the CFTR.

A. cystic fibrosis transmembrane conductance regulator allows Cl− ions to flow out of the cell, following their concentration gradient.

B. ATP binding to CFTR’s two nucleotide-binding domains appears to close the Cl− channel, and the hydrolysis of one ATP opens it (the other ATP remains intact).

C. the CFTR channel can open only if its regulatory domain (which is unique among ABC transporters) has been phosphorylated, thus regulating the flow of ions across the membrane.

D. The maintenance of electrical neutrality requires that the Cl− ions transported by the CFTR be accompanied by positively charged ions, mainly Na+. The transported ions are osmotically accompanied by water, thus maintaining the proper level of fluidity in secretions of the airways, intestinal tract, and the ducts of the pancreas, testes, and sweat glands.

Which of the following combination is correct?

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#Question id: 20268

#Unit 7. System Physiology – Animal

Choose correct statements about synthesis and processing of antidiuretic hormone and oxytocin.

a. ADH and oxytocin are homologous nonapeptides (containing nine amino acids).

b. Are synthesized in the supraoptic and paraventricular nuclei of the hypothalamus respectively.

c. The ADH neurons have their cell bodies primarily in the paraventricular nuclei.

d. The oxytocin neurons have their cell bodies primarily in supraoptic nuclei of the hypothalamus.

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#Question id: 10868

#Unit 10. Ecological Principles

Which of the following relationships describes competition?

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#Question id: 28710

#Unit 2. Cellular Organization

Find out the correct statements about Anterograde transport.

a) transport from the Golgi to the ER, is the vesicle trafficking step in the secretory pathway is mediated by COPI vesicles

b) transport from the ER to the Golgi, the first vesicle trafficking step in the secretory pathway is mediated by COPII vesicles

c) Anterograde transport by COPI vesicles coated with Coat Proteins – Coatomers

d) transport through the Golgi occurs by cisternal maturation

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#Question id: 2306

#Unit 2. Cellular Organization

The cells of the Eukarya can grow larger than the cells of the Bacteria or the Archaea because: