<span>The answer is A. The troposphere layer has the greatest air pressure because it is the layer that is closest to the Earth and air pressure is greatest near the surface of the Earth.
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Answer:
Option A, Viruses contain either DNA or RNA.
Explanation:
Virus is a non-living microscopic molecule that requires a host to live in and reproduce. All the viruses have nucleic acid either in the form of DNA or RNA. DNA or RNA is genetic material that is enclosed with in a membrane known as capsid. Capsid is also made up of protein. They are extremely small, even smaller than a normal cell and only consist of package of nucleic acid and protein.
Hence, option A is correct
All visual pigments contain retinal
derived from vitamin A
Answer:
The option that is not part of the chromosomes is D. Many strands of RNA
Explanation:
Chromosomes can be described as structures made up of DNA that is coiled around proteins called histones. The genes are made up of NA and are present on the chromosomes. Each chromosome carries alleles of different genes. Hence, all other options A)A strand of DNA. B) A gene C) Many proteins are all part of a chromosome except for the option D)Many strands of RNA.
RNA is not a part of the chromosomes. The DNA is transcribed into RNA though.
