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
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
