When two protein chains combine to form an active protein, the structural level is quaternary.
<h3>What is a quaternary structure?</h3>
The quaternary and tertiary structure of a protein is the tridimensional shape of the protein, which involves protein domains.
The quaternary protein structure refers to the different arrangements generated by different protein subunits.
The primary structure of a protein involves its amino acid sequence, whereas the second structure involves protein chains.
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Answer:
They are 3 in numbers
Explanation:
which are the airway, the lungs, and the muscles of respiration
<span>B. respiratory and circulatory
When oxygen is inhaled it is then brought to the lungs. It soon goes through a series of steps which guide's the oxygen (which are now molecules) to the blood. The blood then takes the oxygen molecules through out the body, so now those molecules are spread through out the body.
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Answer:
The first number indicates the number of carbon atoms and the second number indicates the number of double bonds.
Answer:
Option C.
Psilotum.
Explanation:
Psilotum is a genus of whisk ferns. They are vascular plants. They lack true stem and true leaves, their stems is the organ that contain the conducting tissues. They have stems with many branches and synangium with three lobes. The synangia is is fused sporangia that produce spores. They have rhizome which form rhizoids and help to anchor the psilophyte sporophyte.
