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USABO Open Exam UPDATED 2025. ACTUAL EXAM QUESTIONS AND VERIFIED ANSWERS/ACCURATE SOLUTIONS. ALREADY GRADED A.
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[Date]
Integral transmembrane proteins are proteins imbedded in the cell membrane. Which of the following amino acids would you MOST expect to find in the transmembrane region of such proteins? [ ] A. Lysine [ ] B. Serine [ ] C. Tryptophan [ ] D. Arginine - ANSC Tryptophan (it is non polar and does not have a charge) Allopatric speciation refers to species formed after which type of separation: [ ] A. niche [ ] B. temporal [ ] C. behavioral [ ] D. geographic - ANSD
[Date] During migrations, some birds use which of the following as reference frameworks? I. The sun II. Constellations III. Earth's magnetic field [ ] A. I only [ ] B. I and II only [ ] C. I and III only [ ] D. I, II, and III - ANSD Generally, there are more species per square kilometer in which of the following types of ecosystem? [ ] A. Temperate grassland [ ] B. Arctic tundra [ ] C. Boreal forest [ ] D. Coral reef - ANSD In many types of cancer, the function of the p53 gene is lost. Wild-type p53 is MOST likely to be a [ ] A. proto-oncogene
[Date] [ ] A. Simple diffusion [ ] B. Facilitated diffusion [ ] C. Active transport [ ] D. Osmosis - ANSB Predation is considered a _________ interaction, while Mutualism is considered a ___________ interaction. [ ] A. +/+, +/+ [ ] B. +/0, -/- [ ] C. -/-, +/+ [ ] D. +/-, +/+ - ANSD Protostomes have _____ and _____ types of cleavage. [ ] A. spiral ... determinate [ ] B. spiral ... indeterminate [ ] C. radial ... determinate [ ] D. radial ... indeterminate - ANSA Pg 661 Rods and cones are associated with _____ and _____ vision, respectively.
[Date] [ ] A. Light/dark...color [ ] B. Color...light/dark [ ] C. Near...far [ ] D. Far...near - ANSA RUBP is used and PGA is formed in: [ ] A. glycolysis [ ] B. the Kreb's cycle [ ] C. light reaction of photosynthesis [ ] D. dark reaction (Calvin cycle) of photosynthesis - ANSD Suppose gene "C" is the gene for color. Its dominant allele has the effect of allowing the production of fur color while its recessive allele interrupts color production. At another locus, there exists another gene that influences color, at which black (B) is dominant to brown (b). What is the relationship between these genes called? [ ] A. Epistatic [ ] B. Peralogous [ ] C. Dominant [ ] D. Antagonistic - ANSA
[Date] [ ] C. right atrium, right ventricle, lungs, left atrium, left ventricle, body [ ] D. right atrium, right ventricle, body, left atrium, left ventricle, lungs - ANSC The promoter region of a prokaryotic gene is located ______ to the gene and is the binding site for ______. [ ] A. 3'...DNA polymerase [ ] B. 3'...RNA polymerase [ ] C. 5'...DNA polymerase [ ] D. 5'...RNA polymerase - ANSD The velocity of action potential conduction across a nerve axon is increased by the presence of the myelin sheath. In the peripheral nervous system, what cell myelinates the axon? [ ] A. Oligodendocyte [ ] B. Astrocyte [ ] C. Schwann cell [ ] D. Microglial cell - ANSSchwann cell Unlike most polypeptide hormones, steroid hormones are unique in that they [ ] A. Activate gene transcription
[Date] [ ] B. Diffuse across cell membranes [ ] C. Can bind proteins [ ] D. Can be used as therapeutic drugs - ANSB What enzyme does HIV use to convert RNA to DNA? [ ] A. DNA gyrase [ ] B. RNA polymerase [ ] C. Reverse transcriptase [ ] D. DNA helicase - ANSC What glycolytic product is shuttled to the mitochondria in aerobic respiration? [ ] A. Acetyl-CoA [ ] B. Fumarate [ ] C. Succinyl-CoA [ ] D. Pyruvate - ANSD Which group of plants has vascular tissue but does not produce seeds? I. Mosses II. Ferns
[Date] Which of the following is NOT a characteristic of all chordates? [ ] A. notochord [ ] B. vertebrae [ ] C. pharyngeal slits [ ] D. postanal tail - ANSB Which of the following is NOT a mode of natural selection? [ ] A. stabilizing selection [ ] B. sexual selection [ ] C. directional selection [ ] D. diversifying selection - ANSB Which of the following is true for transport in xylem? [ ] A. The primary force involved is osmotic pressure [ ] B. Xylem is the primary site for transport of sucrose [ ] C. Movement through xylem depends mainly on transpiration [ ] D. All of the above - ANSC
[Date] Which of the following is TRUE of prokaryotes? I. Simultaneous transcription and translation II. Presence of intron sequences III. Circular DNA [ ] A. I and II only [ ] B. I and III only [ ] C. II and III only [ ] D. I, II, and III - ANSB Which of the following organisms is INCORRECTLY paired with its trophic level? [ ] A. Human - tertiary consumer [ ] B. Beetle - secondary consumer [ ] C. Grass - primary producer [ ] D. Cyanobacteria - primary producer - ANSB Which two functional groups are always found in amino acids? [ ] A. Amine and sulfhydryl [ ] B. Sulfhydryl and carboxyl
