Cyanobacteria,or Blue-Green Algae,are Considered the Most Ancient Organisms Capable of Photosynthesis.Given

question 7

Multiple Choice

Cyanobacteria,or blue-green algae,are considered the most ancient organisms capable of photosynthesis.Given what you know about cyanobacteria,which of the following is the more similar species?

• A)Rickettsia rickettsii;A unicellular intracellular pathogen that infects warm-blooded animals,including humans,causing Rocky Mountain spotted fever.
• B)Halobacterium salinarum;A unicellular obligate aerobe that often inhabits hypersaline lakes.This species produces gas vesicles in order to maximize its access to oxygen at the lake's surface.
• C)Nitrosolobus multiformis;A unicellular rod-shaped nitrifying bacterium that inhabits subsurface soils at depths associated with plant roots.
• D)Nostoc verrucosum;A filamentous species often found in shallow streams and creeks that is capable of fixing atmospheric nitrogen using specialized cells known as heterocytes.

---

Definitions:

Variable Cost

A cost that varies with the level of output or production, such as materials and labor directly involved in manufacturing.

Fixed Costs

Expenses that do not change with the level of goods or services produced by a business, such as rent or a salaried employee's wages.

Variable Costs

Expenses that change in proportion to the activity or volume of production, sales, or services rendered.

Fixed Costs

Charges that are unaffected by production or sales volume, for example, monthly rent or payroll expenses.