Biochemistry Quiz & Flashcards

Enzymes lower activation energy, speeding up reactions without altering equilibrium.

DNA stores genetic information; RNA and proteins have different roles.

Amino acids have both an amino and a carboxyl group; other options are characteristic of different biomolecules.

Phospholipids provide the fluid matrix of the membrane, while cholesterol and proteins play stabilizing and functional roles.

ATP is the main energy carrier; it does not store genetic information or act as a structural component.

Non-competitive inhibitors bind to a different site, changing enzyme shape and reducing activity.

Dehydration synthesis forms bonds with water release; hydrolysis breaks bonds.

Carbon is essential in all organic molecules, forming the backbone of the structures.

Vitamins often act as coenzymes; they do not store energy or act as genetic material.

Carbohydrates primarily supply energy, while proteins, nucleic acids, and enzymes have other functions.

Proteins consist of amino acids, whereas carbohydrates are composed of sugar units.

Competitive inhibitors bind the active site; non-competitive inhibitors bind elsewhere, affecting enzyme activity.

Cellulose is the main component of plant cell walls, providing structure and support.

rRNA forms the core of ribosomes; other options are functions of different types of RNA.

DNA is typically double-stranded and contains thymine, while RNA is single-stranded and contains uracil.

Epinephrine serves as both a hormone and neurotransmitter; others do not have this dual role.

Hemoglobin's main function is to transport oxygen in the blood.

Glycolysis breaks down glucose to pyruvate; other processes involve different metabolic pathways.

Simple carbohydrates consist of short sugar chains, while complex carbohydrates have longer chains.

Proteins, as enzymes, catalyze biochemical reactions; other macromolecules have different roles.

Chaperone proteins assist in the proper folding of other proteins.

RNA polymerase initiates transcription by binding to DNA; other molecules have different functions.

Nucleotides contain a phosphate group, whereas nucleosides do not.

Translation converts mRNA into protein, while transcription and replication involve nucleic acids.

Phospholipids form the bilayer structure of cell membranes; other components have different functions or locations.

Antibodies recognize and neutralize pathogens; other functions pertain to different molecules.

Extreme pH can denature proteins by altering their structure; other factors affect reaction rates.

DNA carries genetic information, while RNA, proteins, and lipids have different roles.

Cholesterol stabilizes cell membranes; other roles are not related to cholesterol.

Mitochondria are the site of ATP production; other processes occur elsewhere in the cell.

Gluconeogenesis synthesizes glucose, while glycolysis and fermentation involve different pathways.

Proteins can function as enzymes, catalyzing reactions; other macromolecules do not have this role.

Lipoproteins transport lipids, while hemoglobin, insulin, and glycogen have different functions.

Lactic acid accumulation leads to muscle fatigue, not improved performance or endurance.

Pepsin is a protease that breaks down proteins; other functions are performed by different enzymes or substances.

Lipids provide structural integrity and a barrier in membranes; other functions are not related to membrane lipids.

Cytochrome c is part of the electron transport chain; other proteins have different roles.

Vitamin C acts as an antioxidant; it does not provide energy or serve as a structural component.

Splicing removes introns from pre-mRNA; other processes involve different aspects of gene expression.

Lipids are used for long-term energy storage, while carbohydrates are for short-term energy.

The rough ER is involved in protein synthesis; other functions are associated with different cellular structures.

ATP is known as the cell's energy currency, providing energy for cellular processes.

Lactase breaks down lactose; other functions are performed by different enzymes.

Insulin regulates blood sugar levels, while other proteins have different roles.

The active site of an enzyme is specifically shaped to bind certain substrates.

RNA can store genetic information in some viruses, unlike proteins, lipids, or carbohydrates.

Collagen is a major structural component of the extracellular matrix, while other substances serve different functions.

Rickets is caused by a lack of vitamin D, while other conditions are related to different deficiencies.

Myoglobin stores oxygen in muscle cells, while other functions are associated with different molecules.

Proteins are essential for building and repairing tissues, while other nutrients serve different roles.

RNA is typically single-stranded and contains uracil, unlike DNA.

Keratin provides structure to hair, nails, and skin; other proteins have different roles.