Senescence of the Immune System Makes Older People More Subject

question 22

Multiple Choice

Senescence of the immune system makes older people more subject to cancer and infectious disease because of a decline in

• A)alpha and beta globulins.
• B)red blood cells and platelets.
• C)complement proteins.
• D)prothrombin and fibrinogen.
• E)antigen-presenting cells and helper T cells.

---

Definitions:

Glucose

An elementary sugar that is critical for energy production in living things and is included in a wide range of carbohydrates.

Fructose

A simple sugar (monosaccharide) that is naturally found in fruits, honey, and some vegetables, known for being a part of sucrose (table sugar).

Photoheterotrophs

Organisms that obtain their energy from sunlight but rely on organic compounds from the environment as their carbon source.

Photosystem I

A component of the chloroplast's thylakoid membrane in plants that is involved in the light-dependent reactions of photosynthesis, specifically known for aiding in the process of converting solar energy into chemical energy.