Answer:
d. The carbon atoms came from carbon dioxide and were incorporated into sugars through photosynthesis in the grass.
Explanation:
Grass eating cows are heterotrophs and can not synthesize the organic sugars by themselves. They derive it from grasses they eat.
Grasses are the autotrophs that can fix atmospheric carbon dioxide into glucose in the presence of sunlight by the process of photosynthesis. The extra glucose formed during photosynthesis is stored in the cells of grasses in the form of starch and becomes a source of carbon for herbivores such as cows.
The main substance re-absorbed into the blood in the nephron are glucose, electrolytes (sodium, potassium, chloride) and water.
Almost all the glucose is reabsorbed at the proximal tubule of the nephron. Sodium, potassium and chloride are reabsorbed at the ascending loop of Henle, and water is reabsorbed at the descending loop of Henle.
Other nutrients that are reabsorbed are magnesium, phosphates, carboxylate, bicarbonate, amino acids, some urea, proteins and oligopeptides.
Reabsorption occurs in two steps namely active or passive extraction of sustances from the fluid in the tubules of the nephron, and into the interstitium , then transport of these substances from interstitium and into the bloodstream.
The correct answer is: ATC GAA CCG TA
The unique - tertiary structure of the enzyme is what makes it unique - this in combination with the receptors at the active site confer specificity.
