Question

unit 1 cumulative test (characteristics of life, biomolecules, cell structur
29 of 42
the absence of which organelle found in most mature animal cells allows red blood cells to maximize oxygen transport?
nucleus
cell wall
dentrites
vacuoles

Explanation:

1. Analyze each option:

• Cell wall: Animal cells (including most mature ones) do not have cell walls, so this is not the organelle absent in red blood cells that's present in most mature animal cells.
• Dendrites: Dendrites are part of neurons, not a typical organelle in most mature animal cells relevant to red blood cells.
• Vacuoles: While animal cells have small vacuoles, the absence of vacuoles isn't related to maximizing oxygen transport in red blood cells.
• Nucleus: Mature red blood cells lack a nucleus, which allows more space for hemoglobin (the protein that carries oxygen), thus maximizing oxygen transport. Most mature animal cells (like skin cells, muscle cells etc.) have a nucleus.

Answer:

A. nucleus