Refer to the Figure of the Cellular Slime Mold Dictyostelium

question 37

Multiple Choice

Refer to the figure of the cellular slime mold Dictyostelium. What is occurring at arrows 1 and 3?

• A) At arrow 1 spores have been released, and at arrow 3 spores have germinated and have grown into a fruiting body.
• B) At arrow 1 a single large spore has been released, and at arrow 3 a plasmodium has formed.
• C) At arrow 1 feeding amoebas have run out of food, and at arrow 3 aggregated amoebas have formed a mobile slug.
• D) At arrow 1 a large amoeba has hatched from the spore case, and at arrow 3 the amoeba has become mobile.
• E) At arrow 1 a feeding amoeba has begun searching for food, and at arrow 3 the amoeba has run out of food and started forming a fruiting body.

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Definitions:

Alertness

A state of active attention and readiness to respond to stimuli or challenges presented.

Hypothalamus

A region of the brain below the thalamus that coordinates both the autonomic nervous system and the activity of the pituitary, controlling body temperature, hunger, thirst, and other homeostatic systems.

Neural System

The network of nerve cells and fibers which transmits nerve impulses between parts of the body, enabling communication between the brain, spinal cord, and other areas.

Limbic System

A complex system of nerves and networks in the brain, involved in basic emotions such as fear and pleasure, as well as drives like those related to hunger and sex.