Are the following statements true or false? 1. Electro-negativity describes how

Question

Are the following statements true or false?

1. Electro-negativity describes how strongly a nucleus will attract electrons. The nucleus which is the highest in this character will attract electrons more strongly and create a polar covalent bond.

2. Chemical gated channels (in contrast to voltage gated channels) respond to signal molecules and neurotransmitters by opening ion channels and permitting ions to enter or leave the cells.

3. Receptor-mediated endocytosis is a mechanism whereby only specifically selected materials are brought into the cell via clathrin-mediated process.

4. Brownian ratchet is a type of a biased diffusion.

5. G proteins can “self-inactivate” by hydrolyzing the bound ATP.

6. Protein kinase A makes cAMP

Explanation / Answer

1. True. Electronegativity is the measure of ability of nucleus to attract electrons. More electronegative is the molecule more electron it can attract. For example in water oxygen being more electrongative attract the electrons.

2. True. These channels by sensing chemicals such as neurotransmitter allows passage of ions Suh as caullcium, sodium etc., to pass through the membrane.

3. True. This is also known as clathrin mediated endocytosis. In this process, specific molecules are endocytosed in the cell by inward bidding of the plasma membrane vesicles. These vesicles contains receptors which are specific to the molecules which are to be endocytosed.

4. True. Because this process bias the movement of the particles by thermal activated process.

5. False. G proteins gets inactivated when they bind to GDP and gets activated when they bind to GTP.

6. False. Protein kinase A does not make cAMP. PKA gets activated in the presence of cAMP.

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