Only Certain Prokaryotes Can Perform Nitrogen Fixation, but Nitrogen-Fixing Prokaryotes

question 61

Multiple Choice

Only certain prokaryotes can perform nitrogen fixation, but nitrogen-fixing prokaryotes are not known to live inside animals. Thus, how do animals gain access to fixed nitrogen?

• A)They may breathe it in from air that has experienced lightning discharges.
• B)They may ingest nitrogen fixers.
• C)They may ingest plants that harbor nitrogen fixers, or plants that absorbed fixed nitrogen from the soil.
• D)They may ingest other animals that had done either (B)or (C)above.
• E)Answers (B), (C), and (D)above are all possible.

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Definitions:

Periodic Inventory System

A method of inventory valuation for financial reporting purposes where a physical count of inventory is performed at specific intervals, and cost of goods sold is calculated at the end of the accounting period.

Merchandise Purchased

The total cost of goods bought for resale during a specific accounting period.

Purchases Discounts

A reduction in the price of goods that a buyer can take advantage of if they pay by a certain date.

Periodic Inventory System

An inventory method where updates to inventory levels are made at specified periods, typically at the end of a financial year, rather than continuously.