Answer:
Citrate Synthase facilitates the formation of citrate by deprotonating Acetyl CoA and by protonating the carbonyl oxygen of oxaloacetate
Explanation:
Citrate synthase is a key enzyme in the citric acid cycle that functions to catalyze the formation of citrate from oxaloacetate and acetyl-CoA: acetyl-CoA + oxaloacetate + H2O >> citrate + CoA-SH (Coenzyme A ). This enzyme contains three amino acids at its active site that work together to catalyze the conversion of acetyl-CoA and oxaloacetate into citrate. This active site acts by abstracting (deprotonating) a proton from the alpha carbon of Acetyl CoA which serves as the nucleophile. Subsequently, the active site of the enzyme also protonates the carbonyl oxygen of oxaloacetate, which then suffers nucleophilic attack and thereby facilitating nucleophilic substitution reaction.
<span>A. response to a stimulus</span>
- they release nitrogen in the air
- they make nitrogen chemicals which plants can use
- bacteria help to release chemicals from dead plants and animals
Organs of excretion make up the excretory system. They include the kidneys, large intestine, liver,and lungs. The kidneys filter blood and form urine. They are part of the urinary system, which also includes the ureters, bladder, and urethra.
Answer:
The correct answer will be- newly synthesized polypeptide
Explanation:
The process of translation or the synthesis of proteins takes place in the ribosomes which provide a site for the synthesis of polypeptides. The ribosomes are made up of two subunits: small and large subunits which provides slots namely A, P and E sites.
The tRNA brings specific amino acid corresponding to the codon of the mRNA and during elongation, the tRNA molecule moves from A site to P site to E site.
The component which exits the exit tunnel is the formed polypeptide chain which exits from the E or exit site.
Thus, the newly synthesized polypeptide is the correct answer.
