Question

Q23. Consider the following statements about Biosignature:

1. A biosignature is sometimes called chemical fossil or molecular fossil.

2. It is any substance – such as an element, isotope, molecule, or phenomenon – that provides scientific evidence of past or present life.

Select the correct answer using the codes given:

• A. a) 1 only
• B. b) 2 only
• C. c) Both 1 and 2
• D. d) None of the above

Answer 1

The correct option is C

c) Both 1 and 2

Bio signature

• A bio signature (sometimes called chemical fossil or molecular fossil) is any substance – such as an element, isotope, molecule, or phenomenon – that provides scientific evidence of past or present life.
• Measurable attributes of life include its complex physical and chemical structures and also its utilization of free energy and the production of biomass and wastes.
• Due to its unique characteristics, a bio signature can be interpreted as having been produced by living organisms; however, it is important that they not be considered definitive because there is no way of knowing in advance which ones are universal to life and which ones are unique to the peculiar circumstances of life on Earth.