DNA (deoxyribonucleic acid) is a molecule that contains the genetic instructions necessary for the growth, development, functioning, and reproduction of all living organisms. It is composed of smaller units called nucleotides, which are the basic building blocks of DNA.
The correct option is A .
The backbone of DNA is made up of a sugar-phosphate chain. The sugar component in DNA nucleotides is deoxyribose, which is a five-carbon sugar molecule. Deoxyribose is a key structural element in forming the backbone of the DNA strand. Each nucleotide contains one of four nitrogenous bases: adenine (A), thymine (T), cytosine (C), or guanine (G). These nitrogenous bases are the "letters" of the genetic code and pair with each other in specific ways (A with T and C with G) to form the rungs of the DNA double helix.
Single nucleotide of DNA always contains a five-carbon sugar (deoxyribose), a nitrogenous base (adenine, thymine, cytosine, or guanine), and a phosphate group. These components come together to form the fundamental units of the DNA molecule, allowing it to carry and transmit genetic information.
Hence , A is the correct option
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Answer:
A
Explanation:
Awnser is A
Answer:
The scanning electron microscope allows the elaboration of an image in which the surface characteristics of the sample are reflected, thus providing sufficient information on the shapes, textures, and chemical composition of the constituents.
Explanation:
The scanning electron microscope uses electrons instead of light for imaging.
To achieve this, the team has a device that produces an electron beam that allows the entire sample to be illuminated and, through different detectors, the electrons that are produced from the interaction with the surface of the sample are later collected.
All of the organisms go to the bottom of the lake, as surface tension causes the lake to only freeze partly because of the pressure.
Beneath the frozen top layer, the water stays in its fluid form and does not freeze.
Furthermore, oxygen is entrapped under the layer of ice.
As a mark, organisms discover it possible to live comfortably in the frozen lakes.
Thus, All of the organisms go to the bottom of the lake.
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Answer:
Cellular respiration
Explanation:
Herbivores are organisms that feed on plant materials solely. They are usually animals like sheep, cattle, goats with four stomach compartments. They are part of the global carbon cycle which shows how carbon is circulated in nature.
Answer:
Herbivores eat plants, producing carbon dioxide during cellular respiration that is released into the atmosphere.
Explanation:
Answer:
The process of digestion in the human body takes place over six (6) steps. This travel log would be documented with each chapter as a step:
Day 1: Ingestion. I do not know how I got into this dark wet room (mouth) with huge white grinders (teeth), but I do not believe I would make it out in one piece; these grinders keep mashing me up n what I believe to be 'chewing'.
Day 2: Propulsion. There's a tunnel (oesophagus). I feel like I'm going down a wet slide.
Day 3: Physical digestion. I think I'm in some sort of sac-like mechanism (stomach)with thick walls that produce some sort of toxic substance (acids and enzymes) to my body. This is where I die.
Day 4 and 5: Chemical digestion and absorption. There is almost nothing left of me; I am being taking in by the walls of this maze (small intestine). More of the 'toxic' substance is coming from what appears to be leaf (liver) and all my constituents are being disintegrated (by the duodenum). Now there's a larger maze (large intestine or colon). I'm being separated and completely absorbed. The things that aren't useful about me (waste/stool) are being sent away.
Day 6: Defecation. Waste is excreted in the nus through the rectum.
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