Organisms that must rely on complex, high-energy molecules produced by other organisms for survival are
A) heterotrophs.
B) producers.
C) autotrophs.
D) cyanobacteria.
E) denitrifying bacteria.
A
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Which components of an atom do not have a charge?
I. electrons II. protons III. neutrons a. I only b. II only c. III only d. I and II e. II and III
DNA is a double-stranded molecule and RNA is a single-stranded molecule.
a. true b. false
Related to the amoebas, these usually unicellular creatures are able to aggregate under times of stress.
A. cellular slime molds B. water molds C. ciliates D. plasmodial slime molds
Which of the following is true of Domain Archaea compared to other groups?
A) They are the only anaerobes on Earth. B) None of their genes work like those found in eukaryotes. C) Their cell wall and membrane biochemistry is unique. D) Most of their genes are similar to those found in bacteria. Refer to the scenario below, and then answer the following question(s). As part of your field biology independent study, you visit a small lake with an extremely high salt concentration. Searching with nets and other sampling devices, you find no fish, plants, algae, or any visible signs of life in the lake. Still, you decide to take a few samples of the water back to the lab. You find the sample teeming with very small cells, hundreds of times smaller than a typical human cell. These cells have cell walls, which you analyze chemically and find they are not made of peptidoglycan or cellulose.