All Plants Contain Chloroplasts with Both Chlorophyll a and B

question 57

Multiple Choice

All plants contain chloroplasts with both chlorophyll a and b.By comparison,almost all prokaryotic organisms only contain chlorophyll a.One exception is Prochloron,which contains both chlorophyll a and b.According to the endosymbiotic theory,how did photosynthetic plants arise and how did the discovery of Prochloron in the 1970's lend support to this theory?

• A)Photosynthetic plants arose from a prokaryote that engulfed another free-living photosynthetic prokaryote that eventually developed into a chloroplast.Given that all plants contain chlorophyll b,it must have been present in the common ancestor of plants.Prior to the discovery of Prochloron,no bacteria were known to contain chlorophyll b.However,the identification of Prochloron,which contains both chlorophyll a and b,suggests that it is the direct descendent of the common ancestor to all plant chloroplasts,and therefore provides conclusive evidence in support of endosymbiosis.
• B)Photosynthetic plants arose from a prokaryote that engulfed another free-living photosynthetic prokaryote that eventually developed into a chloroplast.Given that all plants contain chlorophyll a,it must have been present in the common ancestor of plants.Prior to the discovery of Prochloron,no bacteria were known to contain chlorophyll a.However,the identification of Prochloron,which contains both chlorophyll a and b,suggests that it is the direct descendent of the common ancestor to all plant chloroplasts,and therefore provides conclusive evidence in support of endosymbiosis.
• C)Photosynthetic plants arose from a prokaryote that engulfed another free-living photosynthetic prokaryote that eventually developed into a chloroplast.Given that all plants contain chlorophyll b,it must have been present in the common ancestor of plants.Prior to the discovery of Prochloron,no bacteria were known to contain chlorophyll b.However,the identification of Prochloron,which contains chlorophyll a,suggests that it is the direct descendent of the common ancestor to all plant chloroplasts,and therefore provides conclusive evidence in support of endosymbiosis.

Develop decision-making skills regarding budget allocation and spending in the context of microeconomic theory.

Understand the relationship between income, prices, and consumption quantities in economic decision-making.

Understand the concept of budget constraints in an economy with dual-currency systems.

Ability to analyze and calculate the consumption choices based on given income and prices.

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Desktop

The primary screen of a computer's graphical user interface, on which windows, icons, widgets, and background wallpaper coexist, serving as a control and navigation center.

Sign-in Screen

The interface element or page where users enter their credentials to access a secured part of an application or website.

Rotate Wheel

A control interface, often found in software or devices, that allows users to scroll or navigate by mimicking the rotation of a wheel.

Mouse Operation

The actions or movements performed using a computer mouse to interact with graphical elements on a screen.