Biology Biochemistry & Metabolism Flashcards
6 cards from real Biology Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Biology Biochemistry & Metabolism flashcards as text
The Krebs cycle occurs in which part of the mitochondria?
Answer: Matrix
The Krebs (citric acid) cycle takes place in the mitochondrial matrix where its enzymes are dissolved.
Which type of bond links amino acids together in a protein?
Answer: Peptide bond
Peptide bonds form between the carboxyl group of one amino acid and the amino group of the next during protein synthesis.
Beta-oxidation is the metabolic process that breaks down:
Answer: Fatty acids
Beta-oxidation sequentially cleaves two-carbon units from fatty acid chains, generating acetyl-CoA for the Krebs cycle.
Competitive inhibition of an enzyme can be overcome by:
Answer: Increasing substrate concentration
In competitive inhibition, increasing substrate concentration outcompetes the inhibitor for the active site, restoring enzyme activity.
Which vitamin is a precursor to the coenzyme NAD+?
Answer: Vitamin B3 (Niacin)
Niacin (vitamin B3) is the dietary precursor used by cells to synthesize NAD+ and NADP+.
Gluconeogenesis is the metabolic pathway that synthesizes glucose from:
Answer: Non-carbohydrate precursors such as lactate and amino acids
Gluconeogenesis uses non-carbohydrate substrates like lactate, glycerol, and glucogenic amino acids to produce glucose, mainly in the liver.