Answer:
Once the oxygen diffuses across the alveoli, it enters the bloodstream and is transported to the tissues where it is unloaded, and carbon dioxide diffuses out of the blood and into the alveoli to be expelled from the body. Although gas exchange is a continuous process, the oxygen and carbon dioxide are transported by different mechanisms.
Transport of Oxygen in the Blood
Although oxygen dissolves in blood, only a small amount of oxygen is transported this way. Only 1.5 percent of oxygen in the blood is dissolved directly into the blood itself. Most oxygen—98.5 percent—is bound to a protein called hemoglobin and carried to the tissues.
Hemoglobin
Hemoglobin, or Hb, is a protein molecule found in red blood cells (erythrocytes) made of four subunits: two alpha subunits and two beta subunits (Figure 20.19). Each subunit surrounds a central heme group that contains iron and binds one oxygen molecule, allowing each hemoglobin molecule to bind four oxygen molecules. Molecules with more oxygen bound to the heme groups are brighter red. As a result, oxygenated arterial blood where the Hb is carrying four oxygen molecules is bright red, while venous blood that is deoxygenated is darker red.
Hydrolysis is when a polymer (such as a peptide bond or fatty acid) is split into smaller segments by adding water.
Answer:
True
Explanation:
gametes from two plant species can combine and produce a haploid zygote
A taxon is a general term that describes any level of the biological classification system scientists use for living things.
<h3>What is a taxon?</h3>
A taxon (plural - taxa) is a term used by taxonomists or biologist to describe a taxonomic group of any rank.
The taxonomic groups we have in biological classification are as follows:
- Kingdom
- Division
- Class
- Order
- Family
- Genus
- Species
Any of the above ranks in taxonomic classification can be regarded as a taxon.
Therefore, a taxon is a general term that describes any level of the biological classification system scientists use for living things.
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The FedEx of the cell are the vesicles.
Vesicles are the structures in which many cell materials are packed and transported. Vesicles are cellular organelles that are composed of a lipid bilayer and they function as cellular envelopes to transport cell materials from one place to another inside the cell.
An example of one material is protein. After a particular protein has been synthesized in the ribosomes of the cell, it is packaged in a vesicle called a transport vesicle. The vesicle carries this package to the Golgi apparatus for final tweaking after which it is again repacked in a new vesicle which transports it to its required destination in the cell.
