DAT Biology (ALL Practice Exam Questions) with Certified Solutions

DAT Biology (ALL Practice Exam Questions) with Certified Solutions An organism is found during a biopsy of lung tissue. It is determined to belong to the genus Streptococcus and is known to cause tuberculosis. What type of organism is this? Bacteria A botanist has discovered a new plant and notes that it is predominantly found in its gametophyte form. Which category does this plant most likely belong to? Bryophyte In the fetal circulatory system, the ductus venosus allows blood to bypass? Liver What would be the expected outcome if the acrosome of a mature sperm failed to develop? Inability to penetrate zona pellucida IgA Found in muccous, salivia, tears, and breast milk. Protects against pathogens IgD Part of the B cell receptor. Activates basophils and mast cells IgE Protects against parasitic worms. Responsible for allergic reactions IgG Secreted by plasma cells in the blood. Able to cross the placenta into the fetus IgM May be attached to the surface of a B cell or secreted into the blood. Responsible for early stages of immunity. Which process immediately follows the penetration of the corona radiata by sperm? Acrosomal reaction Describe how the endometrium is maintained after implantation? the placenta secretes chorionic gonadotrophin (hCG) Regulation of the Lac Operon? When allolactose is present, it binds to and deactivates a repressor protein Which of the following statements is true about energy use by the body? A. Protein is preferentially utilized as an energy source over fat B. Fats have the greatest yield of ATP C. Most glycogen stores are in muscle D. Fat is preferentially utilized as an energy source over carbohydrates E. Amino acids are converted into glucose for use as an energy source B. Fats have the greatest yield of ATP Alternative splicing allows for: Creation of multiple different proteins from one RNA strand A woman using human chorionic gonadotropic during fertility treatment would expect to see stimulated production of which hormone as a direct result? Progesterone Allopatric Speciation Speciation that occurs after a population is divided geographically In response to low blood glucose levels, ACTH is released by the anterior pituitary In which group of organisms can simultaneous transcription and translation be observed? Archaebacteria Which structure is the precursor for the androgens, estrogens, and progesterone molecules necessary for sexual development? Cholesterol What is an agent that is made and released in response to pathogens such as viruses? Interferon What is produced in glycolysis? Pyruvate ATP NADH ADP What excitatory neurotransmitter is found in the neuromuscular junctions of vertebrates? Acetylcholine A lab with microarray analysis equipment is most likely attempting to perform? Measuring gene expression What releases the most number of hormones into the endocrine system? Anterior Pituitary The development of structures in the appropriate segment along the head-tail axis is regulated by which of the following genes? HOX The heart rate is directly initiated by the Sino-atrial node Which organism would be most affected if it were put in a solution with an enzyme that degraded chitin? -Yeast -Pine Tree -Slime molds -Diatoms -Amoeba Yeast because it is a fungi All of the following organisms are segmented EXCEPT for one. Which one is the EXCEPTION? -Earthworm -Dog -Squid -Lobster -Jellyfish Jellyfish What organelle is responsible for lipid synthesis? Smooth ER A scientist submerges an unknown molecule in an aqueous solution and the molecule spontaneously forms a bilayer. What molecule would this be? Phospholipids Two species of monkeys emerge from a common ancestor. They live in the same jungle and are hunted by the same predators. Both species of monkeys have evolved prehensile tails and increased upper arm strength. Despite their similarities, they are not capable of interbreeding. Which form of evolution has taken place? Parallel Which chamber of the heart directly pumps the highest concentration of oxygenated blood for distribution to the rest of the body? Left Ventricle Fish gills are able to acquire sufficient oxygen despite being underwater. Why are most fish gills more efficient than land animals with lungs? Countercurrent exchange Tracheids are specialized plant cells that function to: Transport water -They are part of the xylem What was synthesized during the Miller-Urey experiment? Carbon monoxide, amino acids, several fatty acids, aldehydes