Q13 of 26 Page 1

Explain the role of t-RNA during translation and where does peptide bond formation occurs in a prokaryote?

The job of tRNA is to read the message of nucleic acids, or nucleotides, and translate it into proteins, or amino acids.


The ribosome is the site of translation. The ribosome has three active sites: the A site, the P site, and the E site. The peptide bond formation occurs at the P site in a prokaryote.


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Why many flowering plants have developed devices to discourage self-pollination? Describe any two such outbreeding devices in plants.

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Justify the following statements:

(a) Banana is categorized as true fruit and a parthenocarpic fruit.


(b) Apple fruit develops only after fertilisation but is referred to as a false fruit.


(c) Castor seed is dicotyledonous and albuminous.


OR


“Seeds offer several advantages to angiosperms”. Explain.


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How does Darwin’s theory of natural selection explain the increase in the number of antibiotic resistant pests in our ecosystem?

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Describe the various steps of Griffith’s experiment that led to the conclusion of the ‘transforming principle’.