The right answer is B) NADH and FADH2.
NADH, FADH2 are molecules involved in the Krebs cycle, they carry electrons and H + protons.
NAD is involved in metabolism as an electron carrier in oxidation-reduction reactions, NAD + as an oxidant and NADH as a reducing agent.
Flavin adenine dinucleotide (FAD) is an oxidation-reduction cofactor derived from riboflavin (vitamin B2). It is associated with the enzymes of the class of oxido-reductases to which it is linked by a covalent bond: it is a prosthetic group.
The redox couple is: FAD ==> FADH.
<span>This is the descending pathway. These are the neurons that allow for lower motor neurons to activate movement in the appropriate areas. These are fairly long neurons, having no synapses until they reach the lower neurons in the spinal cord.</span>
Purines and pyrimidines are the nitrogenous bases found in the genetic material. Purines include Adenine (A) and Guanine (G) while pyrimidines include Thymine (T), Cytosine (C) and Uracil (U). Purines always pair with pyrimdine and keeps the strands of DNA at the same distance. THIS IS BECAUSE, PURINES ARE DOUBLE RINGED STRUCTURES AND PYRIMIDINES ARE SINGLE RINGED STRUCTURES. PAIRING OF PURINES WITH PYRIMIDINES MAINTAIN THE STRUCTURE OF THE DNA.
Answer:
Seals store oxygen in their lungs, blood and muscle. Compared to humans, seals have larger lungs because they are also larger animals, but a greater proportion of oxygen is found in the blood rather than in the lungs.