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USABO Open Exam Guide Latest Update 2025 With Complete Questions and Answers(verified answers)|Graded A+

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USABO Open Exam Guide Latest Update 2025 With Complete Questions and Answers(verified answers)|Graded A+

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USABO Open Exam Guide Latest Update
2025 With Complete Questions and
Answers(verified answers)|Graded A+




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 - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT ANSWER-C



What enzyme does HIV use to convert RNA to DNA?

[ ] A. DNA gyrase

[ ] B. RNA polymerase

[ ] C. Reverse transcriptase

[ ] D. DNA helicase - CORRECT ANSWER-C

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