A Scientist Has Taken a Cross Section from a Conifer

question 12

Multiple Choice

A scientist has taken a cross section from a conifer. He notices a small nucleus contained within a lignified cell wall. This cell is MOST likely:

• A)a mature tracheid cell.
• B)an immature tracheid cell.
• C)a mature sieve element cell.
• D)an immature sieve element cell.
• E)either a mature tracheid cell or a mature sieve element cell.

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Definitions:

Body Mass Index

A measure of body fat based on height and weight that applies to adult men and women.

Blood Glucose Level

A measurement that indicates the amount of sugar present in the blood at any given time.

Ghrelin Production

The process of producing ghrelin, a hormone that stimulates appetite, promotes fat storage, and is involved in regulating energy balance.

Leptin Levels

Concentrations of leptin, a hormone produced by fat cells that is involved in regulating appetite and energy balance.