Question

question 21 (4 points) (01.02 mc) which of the following structures represents a protein? question 22 (4 points) (01.03 mc) in which of the following ways is the function of the surface of a microsphere similar to the function of an actual cell membrane? question 23 (4 points) (01.03 mc) which of the following would most likely be key to gathering evidence that the rna world hypothesis is valid?

Explanation:

• Question 21: Proteins are composed of amino - acids. The general structure of an amino - acid has an amino group ($-NH_2$), a carboxyl group ($-COOH$), a hydrogen atom, and a variable R - group attached to a central carbon atom. Option b shows the structure of an amino - acid.
• Question 22: The function of a cell membrane is to create an internal environment different from the outside. Microspheres' surfaces also allow for an internal environment distinct from the external one. Option a is correct as it reflects this similarity.
• Question 23: The RNA - World hypothesis suggests that RNA was the first genetic material. To gather evidence for this, simulating early Earth conditions and studying the resulting molecules is key as it can show how RNA could have formed and functioned in the early Earth environment. Option b is correct.

Answer:

Question 21: B. The structure with an amino group, carboxyl group, hydrogen and R - group attached to a central carbon.
Question 22: A. Both make it possible for the conditions in the interior to be different from the conditions outside.
Question 23: B. Simulation of early Earth conditions and long - term study of the resulting molecules.