Heterocysts

question 37

Multiple Choice

Heterocysts

• A)are found in nitrogen-fixing cyanobacteria.
• B)are used to protect nitrogenase.
• C)produce catalase.
• D)generate oxygen.
• E)are found in nitrogen-fixing cyanobacteria AND are used to protect nitrogenase.

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Definitions:

Oily Substance

Any material with a greasy or slippery consistency, often produced by the sebaceous glands of the skin.

Tears

A secretion from the lacrimal glands used to lubricate the eyes, cleanse them from irritants, and provide antibacterial protection.

Optic Nerve

A paired nerve that transmits visual information from the retina to the brain.

Blind Spot

The point in the visual field that corresponds to the lack of light-detecting photoreceptor cells on the optic disc of the retina where the optic nerve passes through.