/

Which of the following processes causes most of the carbon dioxide from the blood to move into the alveoli?

A. Passive transport using carrier proteins

B. Conversion to carbon monoxide

C. Active transport using energy

D. Diffusion down a concentration gradient

Answer Explanation:

Most of the carbon dioxide from the blood moves into the alveoli through the process of diffusion down a concentration gradient. In the lungs, there is a higher concentration of carbon dioxide in the blood compared to the alveoli. Its molecules, therefore, move from an area of higher concentration (blood) to an area of lower concentration (alveoli) until equilibrium is reached. This is a passive process and does not require energy or carrier proteins.

Therefore, the Correct Answer is D.

Q #1: Which of the following processes causes most of the carbon dioxide from the blood to move into the alveoli?

A. Passive transport using carrier proteins

B. Conversion to carbon monoxide

C. Active transport using energy

D. Diffusion down a concentration gradient

Answer Explanation

Most of the carbon dioxide from the blood moves into the alveoli through the process of diffusion down a concentration gradient. In the lungs, there is a higher concentration of carbon dioxide in the blood compared to the alveoli. Its molecules, therefore, move from an area of higher concentration (blood) to an area of lower concentration (alveoli) until equilibrium is reached. This is a passive process and does not require energy or carrier proteins.
Q #2: A slice of apple left on a table slowly goes brown due to an enzymatic reaction. Dipping the apple slice in lemon juice prevents it from browning Which of the following best explains this result?

A. Lemon juice has enzymes which reverse the browning reaction

B. Lemon juice has a pH which inactivates the enzymes

C. Lemon juice functions to bleach the brown material

D. Lemon juice functions to dilute the brown material

Answer Explanation

Browning of the apple surface is due to the action of the enzyme polyphenol oxidase. Lemon juice is acidic and lowers the pH of the apple's surface. This inactivates the enzyme polyphenol oxidase, which works best at a neutral pH. This in turn reduces the browning action on the apple.
Q #3: Experiments cannot validate hypotheses, only falsify them The statement above can be restated in which of the following ways?

A. Until disproved, an exploration for an observation is valid

B. A hypothesis that has not been falsified remains provisional

C. Certain concepts cannot be subjected to direct experimentation

D. Proving a hypothesis exempt from further testing

Answer Explanation

This means that a hypothesis is considered valid until it is disproved by experimental evidence. However, even if a hypothesis has not been falsified, it is still considered provisional and subject to further testing and scrutiny.

Free Access on TEAS 7 Exams and Study Notes

Access to all TEAS 7 Exams
Performance Tracking and Analysis
Well Documented and Explained Questions and Answers
2000+ Questions and Correct Answers: Answers Well Explained
Libary of Detailed StudyNotes
Topical Questions and Answers on Examinable topics

Join Now