Questions and answers for exam Preparation

MCQs

Total Questions : 159 | Page 13 of 16 pages

Question 121. Which of the following functional groups would make a carbon-based compound the least polar?

Phosphate
Methyl
Carboxyl
Amino

Discuss Question

Answer: Option B. -> Methyl

Question 122.
The element neon (Ne) has eight electrons in its outermost electron shell. How many covalent bonds will Ne readily form?

None
One
Two
Four

Discuss Question

Answer: Option A. -> None

Question 123. Any system that is not at equilibrium

is thermodynamically unstable, although it may be kinetically stable
is kinetically unstable, although it may be thermodynamically stable
is rushing toward equilibrium at a very rapid rate
requires an enzyme to reach equilibrium

Discuss Question

Answer: Option A. -> is thermodynamically unstable, although it may be kinetically stable

Question 124.
The mitochondria were known in the nineteenth century to be osmotically active on the basis of evidence that

the mitochondrial matrix is hypotonic to the cellular cytoplasm
the mitochondrial matrix is hypertonic to the cellular cytoplasm
mitochondria were derived from a symbiotic bacterium
mitochondria are surrounded by a semi permeable membrane

Discuss Question

Answer: Option D. -> mitochondria are surrounded by a semi permeable membrane

Question 125. Which is not true about a photon?

It is a packet of light energy
The shorter the wavelength, the greater the energy of the photons
It is trapped by photosynthetic unit
It donates electron to reduce carbon dioxide to glucose

Discuss Question

Answer: Option D. -> It donates electron to reduce carbon dioxide to glucose

Question 126.
Which of the following elements is likely to form the least polar covalent bond with hydrogen?

Nitrogen
Oxygen
Carbon
Phosphorus

Discuss Question

Answer: Option C. -> Carbon

Question 127.
If the ends of the following polysaccharide are pulled, which one would stretch the most?

Glycogen
Starch
Cellulose
None of these

Discuss Question

Answer: Option B. -> Starch

Question 128. Why do some redox reactions in cells result in the transfer of electrons from a reductant with a higher standard redox potential to an oxidant with a lower standard redox potential?

Redox potentials are defined under standard conditions, and cellular conditions are typically not standard conditions
The rules governing oxidation and reduction apply only in vitro, and not in vivo
Electrons always go from reductants with high redox potentials to oxidants with low redox potentials
None of the above

Discuss Question

Answer: Option A. -> Redox potentials are defined under standard conditions, and cellular conditions are typically not standard conditions

Question 129. . Which cell type is likely to have the most mitochondria?