This set of Marine Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Marine Biosurfactants – Set 2”.
1. Lipopeptides (surfactants) do not cause skin irritation.
a) True
b) False
View Answer
Explanation: Lipopeptides such as palmitoyl pentapeptide and palmitoyl tetrapeptide are used in many cosmetic products especially anti-wrinkle formulations. They do not cause skin irritation like the common anti-aging ingredients like retinol.
2. Sirtuin I is a ________________
a) chemical
b) anti-aging gene
c) bioemulsifier
d) biopolymer
View Answer
Explanation: Sirtuin-I is a gene associated with anti-aging functions. Surfactins derived from marine organisms have been shown to up regulate the gene, elevate collagen levels as well as increase cell growth in cell culture.
3. Which is not a category of biosurfactants used in cosmetic industry?
a) Signal peptides
b) Neurotransmitter-affecting peptides
c) Carrier peptides
d) Hydrophobic peptides
View Answer
Explanation: Biosurfactants used in cosmetic industry are divided into following categories based on their mode of action – carrier peptides, neurotransmitter-affecting peptides, and signal peptides.
4. Chronologically aged skin demonstrates lower procollagen-I mRNA levels.
a) True
b) False
View Answer
Explanation: To alleviate the signs of chronologically aged skin, biosurfactants are used in anti-aging cosmetic formulations. Such skin is linked with lower levels of procollagen-I messenger ribonucleic acid.
5. Peptides and proteins have poor skin permeation because these _______________
a) are charged
b) have high molecular weight
c) are low density
d) are toxic
View Answer
Explanation: Although various peptides have been scientifically proven to reverse the skin aging to a great extent, their poor skin permeability is a major concern for incorporation into cosmetic. Since the peptides are charged at physiological pH these cannot traverse the skin barrier.
6. Toll-like receptors are ___________________
a) epitopes
b) antigens
c) immunogens
d) mediators of immune response
View Answer
Explanation: Toll-like receptors (TLR) are molecules that mediate immune response. Polymorphisms in this gene family result in differences of inflammatory pathways and infection susceptibility amongst individuals.
7. Choose the correct option.
| 1. Enveloped virus | a. Betanodavirus |
| 2. Non-enveloped virus | b. Iridovirus |
a) 1-a, 2-b
b) 1-a, 2-a
c) 1-b, 2-b
d) 1-b, 2-a
View Answer
Explanation: Marine biosurfactins, various salts as well as some esters have potential activity against non-enveloped viruses such as iridovirus and enveloped betanodavirus. In addition there is low in vivo toxicity of these compounds.
8. Which of the following is a surfactin (SF)?
a) Lipopeptide
b) Argireline
c) Leuphasyl
d) Palmitoyl oligopeptide
View Answer
Explanation: Lipopetide is a surfactin, a compound containing lipid and protein moieties. It is used in cosmetic products as an agent that boosts cells’ natural productivity levels and functions by increasing collagen-I and sirtuin-1.
Sanfoundry Global Education & Learning Series – Marine Biotechnology.
To practice all areas of Marine Biotechnology, here is complete set of 1000+ Multiple Choice Questions and Answers.
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