Question

1. For biology, energy is readily available from electron bonds between atoms of equal:

A) charge

B) atomic weight

C) magnetism

2. The order of electronegativity (great to small) of the following elements is:

A) O>>N>C=H

B) N>>C>O=H

C) C=H>N>>O

D) H<C=O<<N

3. 2^nd law of thermodynamics implies that for a multimer and all its monomeric subunits, (3 point)

A) many multimers in a system is a more stable situation than one monomer in that system

B) all monomeric subunits in a system is a more stable situation than the one multimer in that system

C) all monomeric subunits in a system is a less stable situation than the one multimer in that system

D) one multimer in a system is a less stable situation than many multimers in that system.

4. Reactions with a positive delta G

A) can occur as part of coupled reaction

B) are exergonic

C) are reactions that can never happen

D) reactions that do not require activation energy

5. Of the products of this redox reaction, compared to the reagents (3 point)

        XH + Y -> X + YH

A) X is oxidized, more stable

B) X is reduced, less stable

C) Y is reduced, less stable

D) A and C

Answer 1

Q.1. Answer- c) magnetism

Explanation- electron is negatively charged and nucleus has positively charged protons, these electrons attracts protons of opposite atom by electromagnetic force and vice versa. The eletlctons are present between two nucleus forms chemical bond and this energy is readily available from electron bonds between atoms of equal magnetism.

Q.2. Answer- A) O>>N>C=H

Explanation- electronegative atom attracts electrons towards itself and each atom has different electronegativity and in periodic table it increases from left to right from carbon to fluorine. So the order of electronegativity is F>O>N>C>H. So that correct order o electronegativity is O>>N>C=H

Q.3. Answer- C) all monomeric subunits in a system is a less stable situation than the one multimer in that system

Explanation- second law of thermodynamics states that entropy of universe always increases and entropy is measurement of randomness. So that if monomers are joined in ordered manner to form multimer then entropy decreases and it is more stable but when monomers are not arranged in particular manner and are destributed in system then it increases randomness of system, increase in randomness by all monomeric subunits is less stable. So that according to second law of thermodynamics, all monomeric subunits in a system is a less stable situation than the one multimer in that system.

Q.4. Answer- D) A And C

Explanation- In this reaction, X is oxidized and Y is reduced because compound X has lost the proton and Y has accepted the proton. According to definition, species that looses electron or ptoton is oxidized and a species that accepted electron or proton is reduced. So that X is oxidized, more stable and Y is reduced , less stable.