The Question is from neet-zoology locomotion-and-movement , and it was created by the author T HARITHA

Question

The '9+2' arrangement of microtubules is a characteristic feature of:

T HARITHA · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Structure of cilia and flagella
 **Related Topics**: Cell biology, cytoskeleton, eukaryotic cell structure
 **Prerequisites**: Basic understanding of microtubules and their function.
## SOLUTION PATHWAY
**Given Information**:
  The question describes a '9+2' arrangement of microtubules.
  The options are cilia only, flagella only, both cilia and flagella, and microfilaments.
**Method & Steps**:
 1. Identify the structure with the '9+2' arrangement.
  Reasoning: The '9+2' arrangement refers to the arrangement of microtubules in the axoneme of cilia and flagella.  Nine pairs of microtubules surround two central single microtubules.
  Formula/Rule: None directly applicable; this is a descriptive biological fact.
 2. Determine which structures possess this arrangement.
  Working: Both cilia and flagella exhibit the '9+2' microtubule arrangement in their core structures (axoneme). Microfilaments have a different structure and function.
  Key Point:  Understanding the structural components of cilia and flagella is crucial.
 3. Select the correct option.
  Result: Both cilia and flagella possess the '9+2' arrangement of microtubules.
  Verification: This is a well-established fact in cell biology.
 ## OPTION ANALYSIS
A :x: Cilia only: Incorrect; flagella also have this arrangement.
B :x: Flagella only: Incorrect; cilia also have this arrangement.
C ✓: Both cilia and flagella: Correct; both structures share this characteristic microtubule arrangement.
D :x: Microfilaments: Incorrect; microfilaments are composed of actin and have a different structure and function.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the '9+2' arrangement with other cytoskeletal structures:  Remembering the specific arrangement of microtubules in cilia and flagella is key.
  2.Assuming only one type of structure possesses this arrangement: Both cilia and flagella share this feature.
 **Quick Tips**:
  1.Visualize the cross-section of a cilium or flagellum to remember the '9+2' arrangement.
  2.Associate '9+2' with motility, as both cilia and flagella are involved in movement.

T HARITHA · Answer

Cilia only

T HARITHA · Answer

Flagella only

T HARITHA · Answer

The correct Option is "Both cilia and flagella"

T HARITHA · Answer

Microfilaments

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