Question

Please answer all

Which of these is a nonpolar hydrophobic molecule?

		A) lipid
		B) sugar
		C) water
		D) NaCl

In an enzyme, strictly the protein portion is termed the _____________________.

		A) cofactor
		B) coenzyme
		C) apoenzyme
		D) holoenzyme

Glycine (Gly) is a(n) _______________.

		A) fatty acid
		B) nucleic acid
		C) amino acid
		D) steroid

Which of these processes generates the most ATP per molecule of glucose.

		A) glycolysis
		B) Krebs cycle
		C) fermentation
		D) chemiosmosis/oxidative phosphorylation

How many double bonds are in the carbon skeleton of a saturated fat?

		A) 0
		B) 1
		C) 12
		D) 100

DNA is comprised of what type of monomers?

		A) amino acids
		B) nucleotides
		C) fatty acids
		D) glucose

The endoplasmic reticulum (E.R.) can be "smooth" or "rough", the presence of _________ make it rough E.R.

		A) DNA
		B) lipids
		C) ribosomes
		D) carbohydrates

You have a healthy culture of bacterial cells, if you want the cells to remain healthy, what type of solution should you provide to your culture?

		A) hypertonic
		B) hypotonic
		C) isotonic
		D) gin and tonic

Answer 1

Ans.

1).

• Lipids forms a large and diverse group of compounds which are mostly non polar in nature.
• This non-polar nature is mostly due to their hydrocarbon nature comprising mostly of non polar carbon-carbon or carbon-hydrogen bonds.
• Since, non-polar molecules are mostly water insoluble, so lipid molecules are non-polar and hydrophobic in nature.

2).

• Enzymes are the protein molecules that helps in catalyzing a biochemical reaction.
• The protein portion of an enzyme is known as apoenzyme that remains inactive.
• Association with an organic or inorganic factor activates this apoenzyme.

3).

• Glycine is an amino acid in which a single hydrogen atom act as it's side chain.
• It is the simplest amino acid with proteinogenic property.
• In many parts of nervous system it functions as a neurotransmitter.

4).

• Various metabolic processes such as glycolysis, Kreb's cycles and oxidative phosphorylation, produce ATP molecules from glucose.
• Among all these processes, the process of oxidative phosphorylation produces most of the ATP molecules (28 ATP).
• So, oxidative phosphorylation is the metabolic process with most ATP molecules production.

5).

• In saturated fatty acids, there all single bonds in the carbon skeleton.
• So, in a saturated fat, there will be no (0) double bonds in the carbon skeleton.

6).

• DNA is a polymer and nucleotides are the monomeric units of DNA.
• Polynucleotide is the polymer of nucleotide.
• There are 4 different nucleotides which can be present in a DNA molecule ; adenine, guanine, cytosine and thymine.

7).

• The endoplasmic reticulum (E.R.) is a eukaryotic organelle which is present in most of the eukaryotic cells.
• There are two subunits of endoplasmic reticulum (E.R.) - rough endoplasmic reticulum and smooth endoplasmic reticulum.
• Ribosomes (manufacturing units of proteins) are attached on the surface of rough endoplasmic reticulum, thus giving it a rough appearance.

8).

• Preservation of desired characteristics of bacterial culture is of vital importance during it's maintainence.
• A variety of modern preservation methods are capable of serving such purpose.
• However, if you want the cells to remain healthy, then it is necessary to provide the cell culture with an isotonic solution that maintains the optimum osmotic pressure within the cells.