USABO Open Exam Study Guide Questions And Answers Verified 100% Correct

USABO Open Exam Study Guide Questions And Answers Verified 100% Correct Unlike most polypeptide hormones, steroid hormones are unique in that they [ ] A. Activate gene transcription [ ] B. Diffuse across cell membranes [ ] C. Can bind proteins [ ] D. Can be used as therapeutic drugs - ANSWER -B In superoxide dismutase 1, an enzyme implicated in amyotrophic lateral sclerosis (Lou Gehrig's disease), a copper ion is bound to the active site and is important for enzyme activity. In this enzyme, copper most likely functions as a(n) [ ] A. coenzyme [ ] B. cofactor [ ] C. allosteric activator [ ] D. allosteric inhibitor - ANSWER -B The order of normal blood flow through the human heart is [ ] A. right ventricle, right atrium, lungs, left ventricle, left atrium, body [ ] B. right ventricle, right atrium, body, left ventricle, left atrium, lungs [ ] C. right atrium, right ventricle, lungs, left atrium, left ventricle, body [ ] D. right atrium, right ventricle, body, left atrium, left ventricle, lungs - ANSWER -C Allopatric speciation refers to species formed after which type of separation: [ ] A. niche [ ] B. temporal [ ] C. behavioral [ ] D. geographic - ANSWER -D Which two functional groups are always found in amino acids? [ ] A. Amine and sulfhydryl [ ] B. Sulfhydryl and carboxyl [ ] C. Carboxyl and amine [ ] D. Alcohol and aldehyde - ANSWER -C Movement of ions across the membrane from higher to lower concentrations through a channel protein is an example of [ ] A. Simple diffusion [ ] B. Facilitated diffusion [ ] C. Active transport [ ] D. Osmosis - ANSWER -B Which group of plants has vascular tissue but does not produce seeds? I. Mosses II. Ferns III. Gymnosperms [ ] A. I [ ] B. II [ ] C. III [ ] D. II & III - ANSWER -B 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 - ANSWER -C Predation is considered a _________ interaction, while Mutualism is considered a ___________ interaction. [ ] A. +/+, +/+ [ ] B. +/0, -/- [ ] C. -/-, +/+ [ ] D. +/-, +/+ - ANSWER -D 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 - ANSWER -B Which of the following is an example of habituation? [ ] A. Chickadees learning new songs when they shift to living in large winter flocks from small family groups. [ ] B. Stalking and attacking litter mates by lion cubs. [ ] C. Hydra initially contract when gently touched, but soon stop responding. [ ] D. Yearly migration of golden plovers from Arctic breeding grounds to southeastern South America. - ANSWER -C 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 - ANSWER -A 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 - ANSWER -D 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 - ANSWER -D 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 - ANSWER -D Which is TRUE of the dark reaction (Calvin cycle) of photosynthesis? [ ] A. It uses oxygen [ ] B. It uses carbon dioxide [ ] C. It produces sucrose