47. When two macromolecules for because there is a net increase in the amount of

Question

47. When two macromolecules for because there is a net increase in the amount of order in the cell. m a complex, the free energy of the system increases A. True B. False 48. A polar covalent bond is defined as a bond in which: A. The electrons are shared evenly between both atoms B. The electrons are transferred to another atom C. The electrons are shared via electrostatic forces D. The electrons are shared unequally between both atoms 49. Which of the following bonds is the weakest, assuming everything else is equal? A. Covalent B. lonic C. Hydrogen is a molecule that accepts a proton in solution, while a_is a molecule that donates a proton A. Base, Acid B. Acid Base C. lonic solution, Charged particle D. Organic molecule, inorganic molecule 51. Generally speaking, amino acids undergo reactions in that direction? A. N- Terminus B. C-Terminus C. North terminus D. Reaction center 52. What type of protein isomers are used in mammalian cells? A. L-form B. D-form C. R-form D. X-form 53. Which subatomic particles can vary between isotopes of the same element, without changing the observed chemical properties? A. Neutron and Elections B. Neutrons C. Protons and Neutrons D. Electrons

Explanation / Answer

47. When two macromolecules form a complex, the free energy of the system increases because there is a net increase in the amount of order in the cell.
A. True

B. False

ANSWER is: B. False

EXPLANATION :

Nonspecific interactions between macromolecules can be favorable when there is large number of water molecules and ions displaced at the interaction interface. This will increase in disorder, even when two larger molecules will be associated and ordered.


48. A polar covalent bond is defined as a bond in which

A. The electrons are shared evenly between both atoms

B. The electrons are transferred to another atom

C. The electrons are shared via electrostatic forces

D. The electrons are shared unequally between both atoms

ANSWER is: D. The electrons are shared unequally between both atoms

EXPLANATION:

2 types of covalent bonds are: polar and nonpolar.

In a polar covalent bond, electrons are shared unequally by the atoms and spend more time close to one atom than the other. As there is unequal distribution of electrons between the atoms of different elements, slight positive (+) and slight negative (–) charges will develop in many diff parts of the molecule.

49. Which of the following bonds is the weakest, assuming everything else is equal?
A. Covalent

B. Ionic

C. Hydrogen

ANSWER is: C. Hydrogen

EXPLANATION:

Hydrogen bonds are weak bonds as they are easily and rapidly formed and broken under normal biological conditions.

50. A ___ is a molecule that accepts a proton in solution, while a ____ is a molecule that donates
a proton

A. Base, Acid

B. Acid Base

C. Ionic solution, Charged particle

D. Organic molecule, inorganic molecule

ANSWER is : A. Base, Acid

EXPLANATION :

Acid is a substance that can donate a proton or accept an electron pair.

Base is a substance that can accept a proton or can donate an electron pair.


51. Generally speaking, amino acids undergo reactions in that direction?

A. N- Terminus

B. C- Terminus

C. North terminus

D. Reaction center

ANSWER is: A. N- Terminus

EXPLANATION:

Amino acids undergo direction from N terminus to C terminus

52. What type of protein isomers are used in mammalian cells?

A. L-form

B. D-form

C. R-form

D. X-form

ANSWER is : A. L-form

EXPLANATION :

Amino acids occurs in L- and D-forms, but only L-forms are used by cells.

53. Which subatomic particles can vary between isotopes of the same element, without changing the observed chemical properties?

A. Neutron and Elections

B. Neutrons

C. Protons and Neutrons

D. Electrons

ANSWER is: B. Neutrons

EXPLANATION :

As the chemical properties are determined by the atomic number. The number of neutrons can vary without significantly changing the chemistry...

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