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1/ G-proteins are a commonly found in cell signaling pathways, which of the following events normally activates a GTP-binding protein?

(a) GTP hydrolysis by the protein

(b)Activation of an upstream GTPase-activating protein

(c)Exchange GDP for GTP by the activation of an upstream guanine nucleotide exchange factor(GEF)

(d)Pi release after GTP hydrolysis

2/ Which of the following inactivates a G-protein?

(a) The β subunit exchanges its bound GDP for GTP.

(b) The GDT bound to the α subunit is hydrolyzed and forms GDP

(c)The α subunit exchanges its bound GDP for GTP.

(d) Theβγ complex inactivates the G-protein

3/ Olfactory receptors where first hypothesized to be numerous receptor types that were able to recognize specific odorants. We now know that olfactory receptors are made up of ONE receptor family, which is one of the largest gene families know in the human genome. Which of the receptors below comprise the olfactory receptor family?

(a)RTK

(b) Delta-Notch

(c) GPCR-cAMP family

(d) Ion Channel Receptors

4/ Which of the following are possible responses a cell may have as a result of activation of a cell signaling pathway?

(a) Change in gene expression

(b) Alteration of activity of metabolic enzymes

(c) Reconfiguration of cytoskeleton

(d) All of these

5/ Which of the following statements about the cytoskeleton is false?

(a) The cytoskeleton is made up of three types of protein filaments.

(b) The cytoskeleton controls the location of organelles in eukaryotic cells.

(c) Microtubules are polymers made up of monomeric subunits, but other two cytoskeletal filaments are not.

(d) The cytoskeleton of a cell can change in response to the environment.

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Reid Wolff
Reid WolffLv2
28 Sep 2019
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