DNA replication and gene expression in archaeans more closely resemble eukaryotic cells than the same processes in bacteria. However both Bacteria and Archaea are prokaryotic. What does this suggest?
A. Eukaryotic cells are descended from modern Archaeans.
B. There must have been 2 origin events, one producing the bacteria and the other producing Archaeans and eukaryotic cells.
C. Bacterial cells are not related to Archaeans.
D. Eukaryotic cells shared a more recent common ancestor with Archaeans than with bacterial cells.
Answer: D
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The process by which the base sequence of an RNA molecule is used to direct the synthesis of a protein is called ________.
A. reverse transcription B. translation C. transcription D. replication
A scout troop sets out on a backpacking trip. Soon, an unexpected storm gets them drenched, and the troop leaders discover that few boys have packed warm clothes. Several scouts start shivering uncontrollably, a sign of hypothermia. The leaders call off the trip and the group heads back to their cars. This shivering response was
A. an attempt to produce heat by burning large amounts of ATP. B. a maladaptive response that wastes energy. C. an attempt to produce heat by creating friction with their clothing. D. a social signal that evolved to alert adults to take action. Shivering is used by mammals to increase body heat when the hypothalamus detects a body temperature below the set point. Although the behavior involves muscles, the outcome is not movement but "wasted" energy in the form of heat. This is an example of nature reusing a body structure for an additional purpose.
Sea anemones are
a. polyp forms of cnidarians. b. medusae forms of cnidarians. c. spongiforms of cnidarians. d. spongiforms of echinoderms. e. polyp forms of echinoderms
A cell with a large number of lysosomes would most likely be very active in
A) cell division. B) lipid synthesis. C) movement. D) phagocytosis.