Question

Which statement is not true of chloroplasts?Choose one:

A. Each has an internal stack of membranes and is enclosed by two membranes.
B. Chloroplasts absorb light and generate oxygen and carbohydrate.
C. Chloroplasts are present in essentially all eukaryotic cells and in certain photosynthetic bacteria.
D. Chloroplasts are thought to have originated from bacteria.
E. Chloroplasts contain their own DNA.

Answer 1

The incorrect statement about chloroplasts is that they are present in all eukaryotic cells and some bacteria; actually, they are found only in autotrophic eukaryotes, not in all eukaryotic cells or bacteria.

Step-by-step explanation:

The statement 'Chloroplasts are present in essentially all eukaryotic cells and in certain photosynthetic bacteria.' is not true. Chloroplasts are specific to autotrophic eukaryotes like plants and algae, where they perform the vital function of photosynthesis. They contain chlorophyll, a green pigment necessary for capturing light energy, and their structure is highly specialized with an outer and inner membrane, and stacked thylakoids. By contrast, photosynthetic bacteria do not have chloroplasts; instead, their photosynthetic apparatus is embedded directly in the cell membrane.