Which of the following features characterizes diatoms?
a. Laminarin and oils as food reserves
b. Protective plates of cellulose within their cells
c. Chlorophylls a and c and carotene
d. Paramylon as a food storage molecule

Guida verificata passo dopo passo

Step 1: Understand that diatoms are a group of algae known for their unique cell walls made of silica, and they have specific pigments and storage compounds that distinguish them from other algae.

Step 2: Recall that diatoms store food primarily as laminarin and oils, which serve as energy reserves, rather than paramylon or other polysaccharides.

Step 3: Recognize that diatoms contain chlorophyll a and c, along with carotenoids such as fucoxanthin, which give them their characteristic golden-brown color; carotene is also a type of carotenoid pigment.

Step 4: Note that diatoms do not have protective plates of cellulose; instead, their cell walls are made of silica (glass-like material), which is a key identifying feature.

Step 5: Based on these characteristics, identify the correct option by matching the features of diatoms with the choices given, focusing on their pigments and food reserves.

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Diatom Cell Wall Composition

Diatoms have unique cell walls made of silica, forming intricate and rigid frustules. Unlike cellulose-based walls found in some algae, their silica plates provide protection and structural support.

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Photosynthetic Pigments in Diatoms

Diatoms contain chlorophylls a and c, along with carotenoids like fucoxanthin, which give them a golden-brown color. These pigments enable efficient photosynthesis adapted to aquatic environments.

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Pigments of Photosynthesis

Food Storage Molecules in Diatoms

Diatoms store energy primarily as laminarin, a polysaccharide, and oils. This differs from other protists that may use paramylon or starch, reflecting their unique metabolic adaptations.

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