How are some protists of commercial value?
What will be an ideal response?
Fossilized diatom shells are used in filtration, cleaning, and as insecticides. Two gelatinous polysaccharides, agar and carrageenan, are extracted from red algae for use as thickeners or stabilizers in foods, cosmetics, and personal care products. Red algae is also used as food such as in sushi. Green algae (sea lettuce) is also harvested for soups and salads. The presence of rhizarian fossils also indicate the location of oil, which is used commercially.
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How is a bacteroid distinguished from a bacterial cell?
A) 16S rRNA gene sequencing B) biochemical tests C) cell morphology D) 16S rRNA gene sequencing, biochemical tests, and cell morphology
In phloem, organic compounds flow through _____
a. collenchyma cells c. vessels b. sieve tubes d. tracheids
Which of the following classes of lipids is synthesized in the Golgi apparatus?
a. Phospholipids b. Glycolipids c. Cholesterol d. Ceramide
On a trip to the Southwest United States, you and a friend collect some seeds from a piñon, a type of pine tree. Your friend also gathers a small bagful of soil from under the piñon tree. Back home, both of you plant your seeds in commercial sterilized
potting soil, but your friend adds a spoonful of the collected dirt to each of her pots. Her seedlings do better than yours. What is the likeliest explanation for your differences? A) Pine seedlings are better adapted to the sandy soil of the Southwest than to commercial potting mix. B) The soil from the Southwest probably contained macronutrients missing from the potting mix. C) The soil from the Southwest probably contained nitrogen-fixing bacteria that colonized the seedlings' root nodules. D) The soil from the Southwest probably contained fungi able to establish a mycorrhizal association with the seedlings' roots.