BIOL 15b Placement Exam
Students receiving an AP or IB score of 5 or higher may elect to pass out of BIOL 15b. You should be aware, however, that a high AP score does not necessarily indicate readiness to continue with upper-level biology electives. For this reason, we strongly recommend all students considering opting out of BIOL 15b take this Biology placement exam to determine preparedness for opting out of BIOL 15b.
Choose the one alternative that best completes the statement or answers the question; no points if you choose more than one answer.
Please refer to the answer page to establish your score.
Score 0-19 corresponds to grade E; we strongly recommend that you take Biol 15b. Score 20-33 corresponds to grades D to C+; we recommend that you take Biol 15b.
Score 34-60 corresponds to grades B- to A+; consider either taking Biol 15b or reviewing relevant material as background for elective courses.
Question 1. In scientific usage, a tentative and testable explanation of an observation is called a:
Question 2. From front (nearest the pupil) to back, the three main cell layers of the retina are:
Question 3. Which of the following is not a method enzymes use to catalyze reactions?
Question 4. A carrier protein or channel protein is needed for molecules to cross the plasma membrane by:
Question 5. Which of the following is not part of the process by which pollen causes allergic reactions?
Question 6. In spermatogenesis, the earliest haploid (n) cell formed is called a:
Question 7. By moving through the mitochondrial electron transport chain,
Question 8. Muscle contraction is stimulated by Ca2+ released from the sarcoplasmic reticulum binding to:
Question 9. Essential amino acids must be eaten in the diet; nonessential amino acids:
Question 10. There is a net movement of CO2 from:
Question 11: Inherited disorders in which the body's immune response is reduced or absent are called:
Question 12. If pregnancy does not occur during a cycle,
Question 13. Plants growing in soil that contains too little phosphorus have difficulty making:
Question 14. Which of the following would be true if a plant cell were exposed to a toxin that let H+ leak freely through the thylakoid membrane?
Question 15. Which of the following hormones is made by the hypothalamus and released by the posterior pituitary?
Question 16. The pancreas is stimulated to secrete bicarbonate by the hormone :
Question 17. The inflammatory response includes all of the following except:
Question 18. Which of the following nucleotide sequences can fully base-pair with another copy of itself to form a short double-stranded DNA?
Question 19. Steroid hormones are ______signaling molecules that bind ______ receptors.
Question 20. Which of the following is secreted by a sexually mature biological man?
Question 21. Replication origins typically consist of a short sequence of DNA where the two strands are relatively easy to separate. Which statement is true?
Question 22. Which of the following is not a function of human helper T cells?
Question 23. The diagram below shows the heart and the major arteries and veins.
Question 24. Nutrients absorbed by the small intestine are transported directly to the liver by the:
Question 25. A woman has had several miscarriages because insufficient amounts of a hormone cause the lining of her uterus to shed during pregnancy, resulting in the loss of the fetus. Which of the following hormones is most likely to help her remain pregnant?
Question 26. Which enzyme is missing from the small intestine of somebody with lactose intolerance?
Question 27. During transcription, RNA is made _______; during replication, DNA is made _______.
Question 28. Which one of the following statements about intracellular transport is true?
Question 29. Blood leaving the capillaries goes directly to the:
Question 30. The changes the Food and Drug Administration made this year for the Nutrition Facts Label on food packages do not include:
Question 31. The ascending limb of the loop of Henle is _______ to water and its filtrate becomes _______ concentrated.
Question 32. The structures of glutamine and glutamic acid at pH 7 are illustrated below. These amino acids differ only in the parts of their side chains that are circled.
Question 33. Epithelial cells are attached to the basal lamina by:
Question 34. The peptide Trp-Ser-Phe could be encoded by ________ different DNA sequences.
Question 35. Which of the following was not a recommendation in the Dietary Guidelines for Americans, 2015, issued by the USDA and DHHS?
Question 36. If my blood pressure is 120/80, it means:
Question 37. During the G1 phase of the cell cycle, the cell checks all of the following except:
Question 38. How do the O2-binding properties of myoglobin help working muscles?
Question 39. Three of the food groups represented on the USDA’s “MyPlate” plate and cup are:
Question 40. The major direct action of the estrogen/progestin contraceptive pill is on the:
Question 41. How does a zygote differ from an ovum?
Question 42. During translation, a transfer RNA (tRNA) brings the amino acid specified by a codon to the ribosome. A tRNA with the anticodon AGG will bring:
Question 43. The organizing centers from which the microtubules of the mitotic spindle grow are:
Question 44. Dissolved CO2 in the blood circulation is converted to bicarbonate ions mostly:
Question 45. Choose from the list below what is generally regarded as the healthiest type of fat to eat.
Question 46. Infertility can be caused by:
Question 47. The diagram below shows a functional unit within the kidney.
Question 48. When the diaphragm and rib muscles relax, the volume of the chest cavity ______ and air flows ______ the lungs.
Question 49. HBB, a gene that encodes beta globin, is on human chromosome 11. At prophase of meiosis I, how many copies of the HBB gene are there in a cell?
Question 50. The oxygen atom of a water molecule is joined to the hydrogen atoms of the same molecule by _______ bonds.
Question 51. Most proteins that enter the endoplasmic reticulum (ER):
Question 52. Basal cells in skin are:
Question 53. Carbon monoxide is poisonous because it binds to hemoglobin
Question 54. In the kidney, most nutrients are reabsorbed from the filtrate in the:
Question 55. In both men and women, fertility normally peaks at age:
Question 56. Louise Brown, the first test-tube baby, was conceived using:
Question 57. Which compound gets reduced (i.e. undergoes reduction) in this reaction?
Question 58. You record the frequency of action potentials in neuron A while stimulating nearby neurons to release neurotransmitter.
Question 59. When people breathe out, air moves directly from bronchus to:
Question 60. Acetylcholine acts upon a G protein-linked receptor on heart muscle to make the heart beat more slowly.