What External Stimulation Is Required by Mammalian Cells to Progress

question 97

Multiple Choice

What external stimulation is required by mammalian cells to progress through the cycle after they have passed the restriction point?

• A)the presence of steroid hormones in their culture medium
• B)the presence of Na⁺ ions in their culture medium
• C)the presence of growth factors in their culture medium
• D)no external stimulation is required after the restriction point is passed
• E)the presence of vitamins in their culture medium

---

Definitions:

Opportunity Cost

The loss of potential gain from other alternatives when one alternative is chosen.

Leisure Time

Time available for ease and relaxation, where no work-related duties are expected, allowing for personal preferences in activities.

Marginal Productivity

The additional output resulting from the use of one more unit of a factor of production, holding other factors constant.

Labor-saving

Technologies or methods that decrease the amount of work required to produce goods or services, often leading to increased efficiency.