Question

Scientists have found that all living things, from bacteria to humans, rely on genetic codes to direct the functions of their cells. These genetic codes are contained in strings of nucleotides and have very similar structures. Which hypothesis for the origin of life on Earth is supported by this evidence?

A. Self-replicating RNA in the early Earth's oceans served as the basis for the DNA in cells today.

B. Nucleotides and proteins that form the basis of life were originally carried to Earth from outer space by comets and meteorites.

C. Greenhouse gases in the atmosphere produced amino acids that are used in cells today.

D. Photosynthesizing bacteria provided oxygen that formed ozone which protected DNA
from mutating into different forms.

Answer 1

Correct answer: A). Self-replicating RNA in the early Earth's oceans served as the basis for the DNA in cells today.

The hypothesis for the origin of life on earth was known to be started from prokaryotes when the first cell is known to be made under the suitable conditions, and presence of starting material in the atmosphere to form the first cell.

The unicellular cell evolved and engulf other cells to form more complex cells known as eukaryotic cells.

Example: Chloroplast and mitochondria

Answer 2

The correct option is A.

Scientists have proposed many hypothesis to explain how life originate on earth. One of these hypothesis is that of replicating RNA. The hypothesis holds that, self replicating RNA, that exist in the ocean in the early period of the earth are the one who gave rise to the DNA molecules that are found in living organisms today.