2. Which statement best describes the cell membrane? * O a long chain of carbohydrates.
two long chains of carbohydrates with protein channels.
O two layers of lipids with protein channels.
three layers of lipids with protein channels.

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The earth consists of a variety of different organisms. despite their diversity, however, some similarities on the structural and metabolic levels may be seen. these similarities can be attributed to a. similarities among organisms in their proteins and nucleic acids. b. the ability of organisms to readily adapt to sudden environmental changes. c. similarities in organisms' habitats and niches. d. the ability of all organisms to interbreed and produce new species.

Which type of respiration takes place when there is no oxygen present

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna