Which of the following would NOT be a characteristic of the first life forms on Earth, that is, the very first primitive cells?
A. Oxygen was required for the cells to survive.
B. A molecule evolved as a way to store genetic information.
C. A barrier made of organic molecules separated the "cell" from the environment.
D. Chemical reactions evolved as a way for cells to capture energy from the environment.
Answer A
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Mitochondria and chloroplasts are bacterial relatives living within eukaryotes as a result of
A. synteny. B. exosymbiosis. C. endosymbiosis. D. draft sequencing by the nucleosome. E. contiguous base pairing.
Because membranes usually are not permeable to polysaccharides, nucleic acids, and proteins, how are cells able to incorporate these molecules?
A) These macromolecules are only incorporated into structures outside the membrane. B) Macromolecules are broken down extracellularly, and their subunits diffuse through the membrane. C) Macromolecules are digested extracellularly, and their subunits move through transport proteins. D) Macromolecules are transported via endocytosis and are digested within the cell. E) both choices C and D
The following is not a common feeding type in rocky intertidal areas:
a. filter feeding. b. scavenger. c. grazer. d. deposit feeding. e. carnivore.
Excess glucose not needed for cellular respiration can be stored as ________ .
a. lactate or glucagon b. glucagon or glycogen c. lactate or glycogen d. adipose tissue or glucagon e. glycogen or adipose tissue