This set of Marine Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Marine Prostaglandins”.
1. Prostaglandins occur primarily in __________________
a) red blood cells
b) leukocytes
c) seminal fluids
d) pancreatic juice
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Explanation: Prostaglandins occur primarily in seminal fluids and in lesser concentrations in mammalian tissues. They communicate with the target cells using autocrine and paracrine signaling and the target cells are usually present in the vicinity.
2. All prostaglandins are composed of a 20-carbon chain.
a) True
b) False
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Explanation: All prostaglandins are derivatives of fatty acids containing two carbon chains and an attached 5-membered ring. Prostaglandins do not circulate in the body instead they are produced locally when required.
3. Naturally occurring prostaglandins are divided into 9 groups based on ____________________
a) substitution of alkyl groups
b) substitution of pentane ring
c) alkalinity
d) acidity
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Explanation: Prostaglandins are divided into 9 groups (A-I) based on the substitution of pentane ring. In a prostaglandin, one five-membered ring and two carbon chains (total 20 Carbon atoms) are present.
4. What is converted into prostaglandins via endoperoxide route?
a) Teichoic acid
b) Kainic acid
c) Selenic acid
d) Arachidonic acid
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Explanation: In mammalian systems, arachidonic acid is converted into prostaglandins by various enzymes via the endoperoxide route. Arachidonic acid is present as phospholipids in the cell which is acted upon by phospholipase-A to release the final precursor.
5. The prostaglandins PGE2, PGD2 and PGF2 are involved in ____________________
a) inflammation
b) intoxication
c) excitation
d) neurotoxicity
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Explanation: The prostaglandins PGE2, PGD2 and PGF2 are involved in inflammation, swelling and causation of fever. E type of prostaglandins is used in the treatment of peptic ulcers.
6. Which type of prostaglandins is useful in the treatment of gynecological disorders?
a) A
b) C
c) F
d) I
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Explanation: F type of prostaglandins is used in the treatment of gynecological disorders and fertility regulation. The prostaglandins are produced locally on demand and regulate the physiological conditions in the body.
7. Which of the following is most stable type of prostaglandins?
a) A
b) C
c) D
d) F
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Explanation: Being polyunsaturated fatty acid derivatives, all prostaglandins are susceptible to air oxidation. Most stable are the F type prostaglandins, these are useful in gynecological disorders and fertility regulation.
8. The first marine prostaglandins were isolated from _____________________
a) carribean gorgonian
b) sea urchin
c) sea pen
d) krill
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Explanation: The first marine prostaglandins were isolated in 1969 by Weinheimer and Spraggins from Carribean gorgonian Plexaura homomalla. The non-mammalian prostaglandins isolated were (15R)-PGA2.
9. The Hawaiian octocoral Telesto riisei is a source of ______________________
a) punaglandins
b) esters
c) phospholipids
d) sulfur dioxide
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Explanation: Hawaiian octocoral Telesto riisei is a source of halogenated prostaglandins called punaglandins. These are highly functionalized prostaglandins that play physiological roles.
10. The source of prostaglandin responsible for causing ogonori poisoning is ___________________
a) red alga
b) brown alga
c) green alga
d) blue-green alga
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Explanation: Japanese red alga Gracilaria uerrucosa is edible and its ingestion can cause gastrointestinal problems, called ogonori poisoning. This is due to presence of prostaglandins identical to PGE2.
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.
