Signaling Molecules in Animals Are

question 60

Multiple Choice

Signaling molecules in animals are

• A)neurotransmitters.
• B)hormones.
• C)pheromones.
• D)local signaling molecules.
• E)all of these.

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Definitions:

Photosynthetic Stem

Stems that are capable of photosynthesis, allowing plants to produce food in places other than their leaves.

Succulent Plants

Plants adapted to arid environments, characterized by thick, fleshy leaves or stems that store water.

Cladodes

Photosynthetic stems found in some plants that resemble leaves, functioning in photosynthesis and sometimes water storage.

Collenchyma

In plants, simple tissue composed of living cells with unevenly thickened walls; provides flexible support.