OBJECTIVE LIFE SCIENCE
BIOCHEMISTRY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Many of the most critical elements of cells are composed mostly or entirely of RNA.
|
|
|
RNA has been demonstrated to act as a catalyst in modern cells.
|
|
|
Modern cells use an RNA template when synthesizing proteins.
|
|
|
In modern cells, RNA provides the template on which DNA nucleotides are assembled.
|
Detailed explanation-1: -Which of the following statements supports the hypothesis of “an RNA world” on early Earth? Single-stranded RNA molecules are linear and cannot form three-dimensional shapes.
Detailed explanation-2: -The hypothesis that RNA preceded DNA and proteins in evolution. In the earliest cells, pre-RNA molecules would have had combined genetic, structural, and catalytic functions and these functions would have gradually been replaced by RNA.
Detailed explanation-3: -Overall the RNA world hypothesis is supported by RNA’s ability to transmit, store and duplicate genetic information as DNA does. Because it can reproduce on its own, performing the task of both DNA and protein, RNA is believed to have once been capable of independent life.