The Main Difference, on the Surface of a Red Blood

question 5

Multiple Choice

The main difference, on the surface of a red blood cell, between the A-B-O major blood groups depends on

• A) the presence or absence of a certain protein sequence.
• B) the presence or absence of a certain sugar.
• C) the presence or absence of an acetyl group on a sugar.
• D) all of these

---

Definitions:

Ulnar Notch

A depression on the distal end of the radius bone that articulates with the head of the ulna, allowing wrist movement.

Medial Epicondyle

The bony projection on the inner side of the humerus just above the elbow joint, where certain ligaments and tendons of the forearm attach.

Greater Tubercle

A prominent area on the lateral aspect of the proximal humerus, serving as an attachment site for the muscles of the shoulder.

Anatomical Neck

The segment of a bone, particularly in long bones like the humerus or femur, located just below the bone's head; it marks the transition between the head of the bone and the shaft.