Answer:
tertiary; quaternary
Explanation:
The orientation of all the atoms of a protein in three dimensions represents its tertiary structure. It includes the folding of the polypeptide chains in a way that brings are far apart amino acids of its secondary structure close together. Various segments of a polypeptide chain interact to form tertiary structures and these segments are held together by different kinds of weak interactions.
However, disulfide cross-links between the segments of polypeptide chains also stabilize the tertiary structure of some proteins. Likewise, disulfide bonds also hold the protein subunits of some proteins together and thereby, contribute to the quaternary structure. For example, two light chains of an antibody are joined together by disulfide bonds.
In the small intestine, muscular contractions squeeze chyme forward, and digestive secretions from the pancreas, gallbladder, and intestinal lining chemically break down the nutrients.
<h3>What is the role of the small intestine in food digestion?</h3>
The small intestine plays is a major organ in the process of digestion.
The small intestine is the part in which absorption of nutrients takes place.
The small intestine is the longest part of the digestive system.
Contraction of smooth muscles presents along the walls of the small intestine help to move food forward while the villi absorb the nutrients.
In conclusion, the small intestine is essential to digestion.
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Answer:
They are different from rocky or terrestrial planets that are made of mostly rock. Unlike rocky planets, gas giants do not have a well-defined surface – there is no clear boundary between where the atmosphere ends and the surface starts! The gas giants have atmospheres that are mostly hydrogen and helium.
Explanation:
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D) creates a variety of intercellular enviroment
The correct option is (A) in biomes at different latitudes.
When climbing a mountain, we can observe transitions in biological communities that are analogous to the changes in biomes at different latitudes.
<h3>
What is biome?</h3>
- A naturally existing species community that is influenced by a region's climate and latitude is referred to as a "biome."
- A place where two biological communities come together and merge is known as an ecotone. It could be small or large, local (the area between a field and a forest), or regional (the transition between forest and grassland ecosystems).
- As you ascend a mountain, different sections experience varying amounts of sunlight and warmth. People see differences in the biological community as an organism ascends a mountain because different latitudes are present.
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