DAT Biology Practice Test 4# (FREE) 0% DAT Biology Practice Test #4 1 / 40 1. Which term refers to a behavior where one animal's threat causes another animal's submission, thus preventing aggression? Dominance Hierarchy Territoriality Appeasement behavior Cooperative hunting Reciprocal altruism 2 / 40 2. A behavioral response that decreases in response to a repetitive, meaningless stimulus is known as: Recovery Habituation Stimulus generalization Sensitization Extinction 3 / 40 3. What is the principle of Malthus's population theory? Population increases geometrically while food production increases exponentially Population increases geometrically while food production increases arithmetically Population increases arithmetically while food production increases geometrically Population and food production both increase geometrically Population and food production both increase arithmetically 4 / 40 4. What is the result of sympatric speciation? Species diverge due to a geographical barrier Different phenotypes are isolated within the same area Species arise from one ancestor as they adapt differently to their environments Species are reproductively isolated via prezygotic and postzygotic isolating mechanisms Species evolve to resemble another species 5 / 40 5. What is a 'polytomy' in the context of a phylogenetic tree? The splitting apart of evolutionary lineages An ancestor and all its descendants The gradual evolution of an interbreeding population without splitting An internal node of a phylogenetic tree that leads to more than two tips An ancestor and some but not all of its descendants 6 / 40 6. What is the role of the mesoderm layer in a trilaminar embryo? It forms the epithelial lining of the digestive, respiratory, and excretory systems It forms the sensory parts of the ear, eye, and nose It forms the Central Nervous System (CNS) and Peripheral Nervous System (PNS) It forms the bone and skeleton, muscles, cardiovascular system, and gonads It forms the pigmentation cells and the enamel of teeth 7 / 40 7. Which hormone is responsible for the maturation of sperm and the development of male secondary sex characteristics? Testosterone Luteinizing Hormone (LH) Estrogen Progesterone Follicle Stimulating Hormone (FSH) 8 / 40 8. What are the two layers of the dermis? Lucid dermis and reticular dermis Papillary dermis and granular dermis Papillary dermis and cornified dermis Papillary dermis and reticular dermis Basal dermis and spinous dermis 9 / 40 9. What occurs as the filtrate travels down the descending limb of the loop of Henle? Solutes are reabsorbed Filtrate becomes more alkaline Water is reabsorbed into the blood Filtrate becomes less concentrated Na+ and Cl- are reabsorbed 10 / 40 10. How does the length of the nephron affect the concentration of urine? The shorter the nephron, the more diluted the urine will be The longer the nephron, the more concentrated the urine will be The longer the nephron, the more diluted the urine will be The length of the nephron has no effect on urine concentration The shorter the nephron, the more concentrated the urine will be 11 / 40 11. Which hormone is responsible for slowing gastric emptying and stimulating the release of digestive enzymes and bile? Gastrin Glucagon Secretin Insulin Cholecystokinin (CCK) 12 / 40 12. What is the primary function of G cells in the stomach during digestion? They produce mucus to protect the stomach lining. They produce the basic bicarbonate ions that neutralize stomach acid. They release gastrin, a hormone that stimulates the release of gastric juice and the secretion of enzymes. They facilitate mechanical digestion through the churning of food. They secrete gastric lipase and pepsinogen. 13 / 40 13. Which of the following is the most common cause of goiter? High blood calcium levels Hypothyroidism Iodine deficiency Hyperthyroidism Excessive secretion of parathyroid hormone (PTH) 14 / 40 14. Which type of bone is found within tendons to help muscles pull? Short bones Flat bones Sesamoid bones Long bones Irregular bones 15 / 40 15. What is the function of Volkmann's canals? To provide support for the body To connect the haversian canals to the periosteum To connect lacunae and the haversian canal To synthesize blood cells To store fat in the medullary cavity 16 / 40 16. Which of the following statements accurately describes the process of wave summation? Wave summation occurs when a depolarization is above threshold potential. Wave summation is also known as the size principle of motor unit recruitment. Wave summation is the process by which twitches add up to create a larger overall contraction. Wave summation occurs when a depolarization is below threshold potential. Wave summation is the process by which different motor units are stimulated at different times to produce the intended amount of muscle contraction. 17 / 40 17. Which type of muscle is characterized by involuntary contractions? None of the above Cardiac muscle Both smooth and cardiac muscle Smooth muscle Skeletal muscle 18 / 40 18. Which part of the ear helps convert mechanical signals into neuronal signals? Round window Semicircular canal Outer ear Middle ear Inner ear 19 / 40 19. Which type of T cell is responsible for directly killing infected cells? Memory T cells CD4 T cells CD8 T cells Helper T cells Natural killer cells 20 / 40 20. Which of the following is NOT a sign of inflammation? Loss of function Increased heat Swelling Numbness Redness 21 / 40 21. Which of the following is true about carbon monoxide (CO) poisoning? It does not affect oxygen transport efficiency It produces carboxyhemoglobin (HbCO). It results from oxygen outcompeting CO for hemoglobin binding It produces carboxyhemoglobin (HbCO2) It increases oxygen binding affinity 22 / 40 22. What is the difference between the left and right lungs in humans? The left lung is smaller and has one lobe, while the right lung is larger and has two lobes The left lung is larger and has two lobes, while the right lung is smaller and has one lobe The left lung is smaller and has two lobes, while the right lung is larger and has three lobes The left and right lungs are identical in size and shape. The left lung is larger and has three lobes, while the right lung is smaller and has two lobes 23 / 40 23. What is erythroblastosis fetalis? A condition where the mother’s Rh factor is negative A condition where the fetus’ blood type is AB A condition where the fetus is unable to produce red blood cells A condition where the mother’s body attacks the fetus because of a blood type mismatch A condition where the placenta does not function properly 24 / 40 24. Which theory explains the upward movement of water in plants due to transpiration? Cohesion-tension theory Capillary action Source to Sink theory Pressure flow hypothesis Root pressure theory 25 / 40 25. What type of plant tissue provides protection and regulation and includes the epidermis and root hairs? Vascular tissue Dermal tissue Stomatal tissue Ground tissue Cambium tissue 26 / 40 26. Which phylum is characterized by five-fold radial symmetry as adults? Echinodermata Mollusca Arthropoda Cnidaria Annelida 27 / 40 27. What is the main difference between gram-positive and gram-negative bacteria? The ability to secrete exotoxins The thickness of the peptidoglycan layer The staining color in gram staining The presence of an outer membrane The presence of a peptidoglycan layer 28 / 40 28. What is the purpose of a genomic library? To store the RNA of an organism's genome. To facilitate the replication of an organism's genome. To store the DNA of an organism's genome. To identify the protein structures of an organism. To store all known species' genomes. 29 / 40 29. What does gene linkage refer to? The process of crossing over during prophase I of meiosis. The process where two genes are randomly assorted in progeny. The process where two organisms are mated to produce offspring. The process where a single gene is examined through two generations of crosses. Genes that are found close together on the same chromosome. 30 / 40 30. What is the one-hit hypothesis associated with? Retinoblastoma gene Incomplete penetrance Null alleles Proto-oncogenes Tumor-suppressor genes 31 / 40 31. What is the purpose of the G1/S checkpoint in the cell cycle? It regulates cell cycle transition from the G1 phase into the S phase, checking for favorable conditions to grow. It regulates the termination of transcription. It ends DNA replication when the replication fork cannot continue. It induces transcription of genes. It initiates DNA replication. 32 / 40 32. In which direction does RNA polymerase extend the RNA during transcription? 5’ → 5’ Both a and b 3’ → 5’ 3’ → 3’ 5’ → 3’ 33 / 40 33. In terms of regulation, what is the role of cyclin-dependent kinases (CDKs) in the cell cycle? They prevent cells from dividing unless attached to an external surface. They act as checkpoints to assess DNA replication accuracy and MPF levels. They halt cell division when the density of cells is high. They phosphorylate certain substrates to signal cell cycle progression. They bind to receptors in the plasma membrane to signal for cell division. 34 / 40 34. What is the primary difference between C4 and CAM photosynthesis? There is no significant difference between C4 and CAM photosynthesis. CAM photosynthesis uses spatial isolation of carbon dioxide, while C4 uses temporal isolation. CAM photosynthesis uses temporal isolation of carbon dioxide, while C4 uses spatial isolation. C4 photosynthesis occurs in plants living in hot environments, while CAM occurs in plants living in cold environments. C4 photosynthesis involves the production of a four-carbon molecule, while CAM does not. 35 / 40 35. What is the role of chlorophyll in the photosynthesis process? Chlorophyll is responsible for the conversion of glucose to ATP. Chlorophyll is responsible for the release of oxygen. Chlorophyll is involved in the absorption of photons. Chlorophyll is involved in carbon fixation. Chlorophyll is not involved in the photosynthesis process. 36 / 40 36. What function do High-density lipoproteins (HDLs) serve in the body? They store triglycerides They transport cholesterol to peripheral tissues They convert triglycerides into free fatty acids They help release triglycerides back into circulation They transport cholesterol to the liver to make bile 37 / 40 37. Why is ATP considered the cellular energy currency? It is used to fuel all cellular processes. It is more stable than ADP. It contains three phosphate groups. It contains an adenine nitrogenous base. It has high energy bonds between the phosphate groups that release energy upon hydrolysis. 38 / 40 38. What role does clathrin play in the transport of substances across the cell membrane? It aids in facilitated transport by acting as a channel protein. It aids in simple diffusion by allowing small, uncharged substances to cross the cell membrane. It aids in active transport by using ATP hydrolysis to pump molecules against their concentration gradient. It aids in endocytosis by forming a pit in the membrane that pinches off as a coated vesicle. It aids in exocytosis by allowing vesicles to secrete material into the extracellular environment. 39 / 40 39. Which of the following statements is true about catalysts? They affect the transition state of a reaction They increase the spontaneity of a reaction They do not affect the energy of the transition state They raise the activation energy of a reaction They shift a chemical reaction to the left 40 / 40 40. What is the definition of an element? A pure substance that has specific physical/chemical properties and can’t be broken down into a simpler substance. A mixture of two or more elements. A pure substance that has specific physical/chemical properties and can be broken down into a simpler substance. A pure substance that has no physical/chemical properties. A mixture of two or more compounds. Your score is LinkedIn Facebook Twitter Restart quiz How did you find this practice test? Your feedback is appreciated Send feedback Click to go back see all Biology Practice Tests
