Biology MCAT Practice Questions
609 free Biology MCAT-style practice questions, covering topics like The Cell, Reproduction, Embryogenesis, The Nervous System, The Endocrine System, The Respiratory System, and more.
Which scientist first observed and described cells under a microscope?Which of the following structures allows oxygenated blood to bypass the liver in the fetal circulation?During normal breathing, which process primarily regulates the concentration of carbon dioxide (CO2) in the blood?What is the purpose of gel electrophoresis in genetics research?In a certain population of mice, a gene locus has two alleles: A and a. If the frequency of allele…Which of the following terms describes an individual with two different alleles for a particular gene?The presence of which of the following antigens determines blood type in the ABO blood group system?Which of the following describes a dihybrid cross?Which of the following is true about stabilizing selection?Which of the following is a characteristic feature of the complement system, a key component of the innate immune response?The SA node, often referred to as the pacemaker of the heart, is located in which chamber of the heart?Which of the following is a characteristic of retroviruses?Which of the following is NOT a function of the pancreas in the digestive system?Which lymphatic structure is primarily involved in the defense against inhaled pathogens and antigens?What is the role of surfactant in the alveoli?During inhalation, the pressure within the thoracic cavity:Which hormone, released by the stomach, stimulates the secretion of gastric acid and pepsinogen?Which of the following hormones is NOT produced by the anterior pituitary gland?Which of the following is responsible for the production of antibodies?Which hormone stimulates contractions of the uterine muscles during childbirth?In a certain gene, a mutation occurs that changes a codon coding for a particular amino acid to a stop…Which of the following cell types is NOT found in the peripheral nervous system (PNS)?What is the primary source of genetic variation in a population?Which of the following factors stimulates an increase in ventilation during exercise?Which of the following blood vessels carries deoxygenated blood?Which type of joint allows for the widest range of motion?Which of the following structures forms from the primitive streak during gastrulation in vertebrate embryos?Which of the following viral structures is responsible for the recognition and binding to host cell receptors?Which cells are primarily responsible for the release of histamine during an allergic reaction?Which of the following describes the role of the ductus arteriosus in fetal circulation?In vertebrate limb development, which signaling pathway is responsible for the differentiation of cells along the proximal-distal axis?Which of the following describes the genetic makeup of an individual for a particular trait?Which of the following is responsible for the production of red blood cells?During which phase of mitosis do the sister chromatids separate and move towards opposite poles of the cell?Which of the following is the correct sequence of embryonic development stages?Which accessory organ of digestion produces digestive enzymes, including pancreatic amylase, lipase, and proteases?Which of the following structures separates the left and right sides of the heart?Which component of blood is responsible for carrying oxygen to the body tissues?Which structure produces eggs (ova) in females?In the digestion of fats, bile salts primarily function to:Which of the following correctly orders the segments of the small intestine, starting from the stomach and ending at the…Which of the following is responsible for the production of new bone tissue?In the small intestine, the majority of nutrient absorption occurs in which of the following regions?Which of the following types of mutations involves the insertion or deletion of nucleotides in a DNA sequence?Which blood cell type is primarily involved in the immune response?Which of the following is responsible for forming the placenta?Which of the following is a characteristic of Braxton Hicks contractions, often referred to as "false labor"?Which of the following best describes the mechanism by which oxygen is transported in the blood?Which structure is responsible for providing rigidity and shape to prokaryotic cells?Which of the following is responsible for transmitting signals from the presynaptic neuron to the postsynaptic neuron?