You recently discovered a new photosynthetic bacterial cell. Based on your knowledge of prokaryotes, what else should be present in the cell?
A. mitochondria
B. viral DNA
C. chloroplasts
D. many infolds of the plasma membrane
E. additional plasmids
Answer: D
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Which of the following statements about the cytoskeleton is true?
A) The cytoskeleton of eukaryotes is a static structure most resembling scaffolding used at construction sites. B) Although microtubules are common within a cell, actin filaments are rarely found outside of the nucleus. C) Movement of cilia and flagella is the result of motor proteins causing microtubules to move relative to each other. D) Chemicals that block the assembly of the cytoskeleton would have little effect on a cell's response to external stimuli. E) The cytoskeleton is produced by transport vesicles of the endomembrane system.
Runoff of rainwater is minimized on
(a) hard surfaces like parking lots. (b) compacted ground. (c) level, spongy ground. (d) steep slopes.
A learned skill that accompanied early hominin evolution was their ability to _____.
a. develop tools b. grasp objects c. stand upright d. live in caves
Standard pasteurization methods are used to
A) reduce microbes that cause spoilage. B) remove all thermoduric microbes. C) reduce microbes that cause disease. D) remove all microbes. E) reduce microbes that cause disease or spoilage.