Biochemistry MCAT Practice Questions
832 free Biochemistry MCAT-style practice questions, covering topics like Amino Acids, Peptides and Proteins, Enzymes, Non-Enzymatic Protein Function and Protein Analysis, Carbohydrate Structure and Function, Lipid Structure and Function, DNA and Biotechnology, and more.
Which of the following factors affect the standard free energy change (∆G°) of a reaction?Which type of signaling molecule acts as a local mediator and is quickly degraded after its release?Which molecule is released during glycogenolysis as a result of the action of glycogen phosphorylase?During translation, which cellular structure is responsible for the synthesis of proteins?Which of the following statements about DNA base pairing is correct?What is the main product of lipid digestion in the small intestine?What is the primary function of cholesterol in cell membranes?Telomeres are located at the:Which of the following membrane transport processes is driven by the hydrolysis of ATP?Which of the following is NOT a component of Complex III in the electron transport chain?What is the function of the Polycomb group (PcG) proteins in gene regulation?Which of the following statements accurately describes the role of topoisomerases in DNA replication?Which amino acid contains a thiol group that can form disulfide bonds?Which of the following is a small RNA molecule that can bind to mRNA and prevent its translation?Which of the following is a storage polysaccharide in animals?Which molecule is required for the synthesis of ATP by ATP synthase?Which of the following membrane proteins is responsible for facilitating the transport of ions down their electrochemical gradients?What type of glycosidic bond is found in cellulose?What is the function of RNA splicing?What is the main function of the nuclear envelope?Which hormone promotes the breakdown of triglycerides into fatty acids for energy production?How does attenuation control gene expression in the trp operon?Which of the following enzymes is NOT involved in the process of oxidative phosphorylation in mitochondria?Which monosaccharide is a major constituent of lactose?Which of the following statements accurately describes the role of RNA polymerase during transcription initiation in prokaryotes?In which direction do solutes move during active transport?The Pentose Phosphate Pathway is an alternative pathway to which major metabolic pathway?Which of the following fatty acids is most likely to exhibit the highest degree of unsaturation?In gluconeogenesis, which enzyme catalyzes the conversion of oxaloacetate to phosphoenolpyruvate?A new drug is discovered that specifically binds to the allosteric site of Enzyme X, enhancing its activity. Which of…Which of the following metabolic states is characterized by an increased breakdown of stored glycogen to provide glucose for energy?Which of the following membrane transport processes does not require a membrane protein?What is the primary component of the plasma membrane according to the Fluid Mosaic Model?Which tissue primarily utilizes fatty acids as its main energy source?Enzyme activity can be affected by:Which of the following is a major component of biological membranes?In the Pentose Phosphate Pathway (PPP), which enzyme is responsible for the conversion of glucose-6-phosphate to ribulose-5-phosphate?Which of the following statements accurately describes the role of coenzyme Q (ubiquinone) in the electron transport chain?What is the primary site of lipolysis in adipose tissue?Which of the following is an example of positive allosteric regulation?Which of the following local conditions would MOST likely have a reversible inhibitory effect on the activity of an enzyme?Which specialized membrane contains ribosomes and is responsible for protein synthesis?How many hydrogen bonds form between adenine (A) and thymine (T) in DNA?Which specialized membrane forms the outer boundary of the nucleus?Which of the following is a product of the non-oxidative phase of the Pentose Phosphate Pathway?Which of the following molecules directly donates electrons to Complex IV in the electron transport chain?Which of the following statements regarding non-competitive inhibition is correct?Which complex of the electron transport chain directly contributes to ATP synthesis?What is the function of the CAP (catabolite activator protein) in gene regulation?Which hormone is primarily responsible for stimulating lipolysis in adipose tissue during times of energy demand?