Mature RBCs lack

Options

A. Aerobic respiration
B. Transcription
C. DNA replication
D. All the above

Answer

To answer the question "Mature RBCs lack:", we can follow these steps:

### Step 1: Understand the structure of mature RBCs
Mature red blood cells (RBCs), also known as erythrocytes, are unique in their structure. They are anucleate, meaning they do not have a nucleus. This is a key characteristic that differentiates them from many other cell types.

**Hint:** Consider what organelles are typically involved in processes like DNA replication and transcription.

### Step 2: Identify the functions of the nucleus
The nucleus is the control center of the cell and is responsible for processes such as DNA replication and transcription. Since mature RBCs lack a nucleus, they cannot perform these functions.

**Hint:** Think about what happens to a cell when it loses its nucleus.

### Step 3: Consider the role of mitochondria
Mature RBCs also lack mitochondria. Mitochondria are essential for aerobic respiration, which is the process of producing energy in the presence of oxygen. Without mitochondria, mature RBCs cannot carry out aerobic respiration.

**Hint:** Reflect on how cells generate energy and what happens when they lack mitochondria.

### Step 4: Analyze the options given
The question provides four options:
a. Aerobic respiration
b. Transcription
c. DNA replication
d. All of the above

Since mature RBCs lack both a nucleus and mitochondria, they cannot perform transcription, DNA replication, or aerobic respiration.

**Hint:** Think about whether any of the options could be true for mature RBCs.

### Step 5: Conclude with the correct answer
Given that mature RBCs lack the nucleus (and thus cannot perform transcription or DNA replication) and lack mitochondria (and thus cannot perform aerobic respiration), the correct answer is:

**Answer:** d. all of the above.

### Summary of Steps:
1. Understand the structure of mature RBCs.
2. Identify the functions of the nucleus.
3. Consider the role of mitochondria.
4. Analyze the options given.
5. Conclude with the correct answer.