<span>Two of the nitrogenous bases present in DNA (Guanine and Adenine) contain two rings and thus are much larger than the other two (Cytosine and Thymine), which have only one.
Nitrogenous bases with two rings (such as G and A) are known as PURINES, whereas nitrogenous bases with a single ring (such as C and T) are known as PYRIMIDINES.
A stable DNA structure is formed ONLY when the two strands are a constant distance
apart which ONLY happens when a PURINE (G or A) on one strand is paired with a PYRIMIDINE (C or T) on the other strand. The strands would have to move much further apart to permit a purine to pair with another purine and would have to move much closer together to permit a pyrimidine to pair with a pyrimidine.
(Source: https://www.amherst.edu/system/files/media/1536/ModGen_1C_TP.pdf )</span>
Quaternary structures of proteins include different protein and non protein moiety to work together.
Option B
<h3><u>Explanation:</u></h3>
Proteins are the polymer of amino acids which are formed after several processing. The polypeptide chains are formed when the transcripted mRNAs are translated in the Ribosomes to produce the polypeptide chains. Then they are further processed by slicings and adding and cutting of several protein parts to this main polypeptide chains and they are slightly folded by means of hydrogen bonds between the polypeptide chain atoms to give a slightly coiled structure. Now this secondary polypeptide undergoes several structural modifications by chaperon proteins which introduce different ionic, disulphide, covalent etc bondings between different parts of polypeptide chain to produce a highly coiled tertiary structure.
Now in some proteins like haemoglobin, there are the protein part i.e globin associated with haem chains, which is the Quaternary structure of proteins. It's formed when different proteins are together associated to perform a particular function.
Photosynthesis is the process used by plants,Algae and certain bacteria to harness energy from sunlight and turn it into chemical energy.
Neonates are at a higher risk of developing respiratory complications upon administering general anesthesia
Explanation:
Anesthesia can lead to a number of perioperative and postoperative respiratory complications especially in neonates. Neonates may require varying levels and types of anesthesia for various conditions starting from central line or VP shunt placement, tracheostomy or gastrostomy tube placements, any excisions, circumscision and any other surgical procedures.
The immature neonatal respiratory system makes neonatal anesthesia a difficult task due to:
Anatomically, the airways are small and alveoli network is immature.
Physiologically, neonatal metabolic rate is very high with more oxygen consumption than adults
Functionally, the lung mechanism is also immature, smaller upper airway resistance and higher lower airway resistance which causes collapse.
Hence, proper care should be taken while anesthetizing neonates with proper communication with the healthcare team including pediatric surgeons, pulmonologist, cardiologist, nursing care, pharmacists etc
Answer:
A tornado.
Explanation:
A tornado is a vertical column of air that is in contact with the ground and the sky. The air in a tornado rotates at high speeds creating a vortex with an empty core. This massive air column moves at high speeds, usually at 180 Km/h, taking everything that is on its way in a short time of about fifteen minutes.
