WHICH OF THE FOLLOWING ARE THE SITES WITHIN THE HUMAN BODY WHERE CARBON DIOXIDE AND OXYGEN ARE EXCHANGED?

1. Which of the following are the sites within the human body where carbon dioxide and oxygen are exchanged? A. Alveoli B. Arteries C. Synapses D. Venules

2. Which of the following describes the most important reason for repeating an experimental investigation? A. To verify the validity of the original findings B. To expand upon the original investigation C. To manipulate the independent variable D. To attempt to disprove the hypothesis

3. Lithium has an atomic number of 3 and a mass number of 7. Which of the following is the number of protons in a lithium atom? A.3 B. 4 C. 7 D. 12

4. Which of the following molecules contains the fewest covalent bonds? A. Water molecule (Hp) B. Ammonia molecule (NH3) C. Methane molecule (CH4) D. Chlorine molecule (CI2)

5. When salt (NaCI) is added to water, it disassociates into Na• and Cl-ions. Which of the following types of chemical bond is present in a salt molecule? A. Covalent bond B. Ionic bond C. Hydrogen bond D. Disulfide bond

6. An example of active immunity is the transfer of A. antibodies through the placenta. B. immunoglobulins through breastfeeding. C. antigens through vaccination. D. immune cells through a blood transfusion. 7. Which of the following classes of biological molecules include enzymes? A. Carbohydrates B. Lipids C. Proteins D. Vitamins

8. Which of the following parts of the circulatory system carries oxygenated blood? A. An artery moving blood from the heart to the lungs B. A vein moving blood to the heart from the body C. An artery moving blood from the heart to a muscle cell D. A venule moving blood to the heart from the liver

9. Which of the following genetic terms describes an observable trait of an individual? A. Heterozygous B. Genotype C. Phenotype D. Homozygous

10. Mutations during which of the following processes in animals will affect offspring of succeeding generations? A. Meiosis B. Mitosis C. Translation D. Transcription

11. Which of the following will happen if mRNA fails to be translated? A. The cell’s nucleus will produce more chromatin. B. Ribosomes will not be able to create protein. C. Mitochondria will release ATP. D. The cell will produce more mRNA

12. Which of the following is the balanced equation for photosynthesis in plant cells? For this one, the formats of the answers are messed up. The balanced formula is 6Co2+6H20+Energy = C6H12O6+6O2. Looking at the answers I think B is the one with the correct formula but cannot be sure. A 3C0+ 3H0 + Energy –)-CH120 + 30 2 266 2 B. 6C0+ 6Hp + Energy–)-CHp + 60 2 616 2 C. CH0 + 30–)-3C0+ 3H0 + Energy 6126 2 2 2 D. CHp + 60–)-6C0+ 6Hp + Energy 616 2 2

13. Which of the following classes of biomolecules are frequently responsible for bringing about cell differentiation? A. Transcription factors B. lnterleukins C. Cytokines D. Nucleotidyl transferases

14. Which of the following is the pH when the concentrations of hydrogen ions and hydroxide ions in an aqueous solution are equal? A. 14 B. 7 C. 1 D. 0

15. Which of the following structures is present in both prokaryotic and eukaryotic cells? A. Golgi apparatus B. Cell membrane C. Endoplasmic reticulum D. Chloroplast

16. Which of the following is the purpose of valves in the venous circulatory system? A. Promoting movement of oxygenated blood toward the heart B. Facilitating stasis of blood in the veins C. Propelling blood through the vena cava D. Preventing backward flow of deoxygenated blood

17. Which of the following cellular organelles is the site of translation during protein synthesis? A. Cell membrane B. Nucleolus C. Golgi apparatus D. Ribosome

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