Question

Several interrelated components carry out modern heredity, transcription, and translation. By accident and co-option, each component likely evolved from the molecular machinery of the RNA World.  Which of the following may have initially functioned as a large ribozyme, with its active site decorated with amino acid cofactors?

a.

transfer RNA

b.

ribosomal RNA

c.

messenger RNA

d.

DNA

e.

miRNA

As described by Lane, five interrelated components carry out oxygenic photosynthesis. Each component evolved from a previously existing structure that initially had a function that was unrelated to oxygenic photosynthesis. Which of the following may have initially used light energy to oxidize inorganic materials and used this reducing power to reduce a coenzyme and ultimately fix carbon?

a.

the oxygen-evolving complex

b.

photosystem II

c.

the thylakoid membrane

d.

photosystem I

e.

all of the above

Answer 1

Answer b.

Ribosomal RNA is found in the ribosomes. This RNA acts as a ribozyme which will helps in formation of peptide bond formation between two amino acid during the translation process. Whereas transfer RNA messenger RNA, DNA and micro RNA does not involve in this process.

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Answer) photosystem 1.

During the light phase of photosynthesis, there is found reduction of nicotinamide adenine dinucleotide phosphate (NADP+ ) into NADPH in the presence of enzyme FNR which is a NADP reductase. This NADH is used in the dark phase of photosynthesis for carryingbout reduction of carbon dioxide.

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