Which of the following is least likely to lead to drug resistance in bacteria?
A) a chromosomal mutation that alters cell membrane permeability
B) a chromosomal mutation that alters the shape of a particular drug binding site
C) receiving a gene that codes for an enzyme that destroys a particular antibiotic
D) receiving a gene that codes for the production of a capsule
D) receiving a gene that codes for the production of a capsule
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Answer the following statement(s) true (T) or false (F)
1. The pneumonia caused by the influenza virus results from the accumulation of fluid and cell debris in the lungs. This occurs during the lysogenic life cycle of the virus. 2. Bacteria typically use binary fission, but under special circumstances sexual reproduction is possible via horizontal gene transfer. 3. Drupes have multiple seeds and fused carpels. 4. Germination inhibitors that must be digested by acids in order to be removed help to ensure the seed will be dispersed with some fertilizer. 5. As the endosperm matures it swells and eventually becomes the fruit.
Which of the following pairs of structure are homologous?
_____ pectoral fin of a shark and front flipper of porpoise. _____ wing of a dragonfly and wing of a hawk. _____ wing of a bluejay and front flipper of a porpoise. _____ forelimb of a dog and forelimb of a horse. _____ wing of a dragonfly and forelimb of a flying squirrel.
Altruism is
A. actions of an animal that immediately benefit others rather than itself. B. a means of ranking animals in a dominance hierarchy. C. displaced aggressive behavior. D. belligerent behavior that helps an animal compete in its society.
The main underlying mutation seen in nearly all Burkitt's Lymphoma tumors is
a) Deletion of the immunoglobulin heavy chain gene leading to a compromised immune system b) A translocation that results in Src being localized improperly to certain regions of the cell c) Truncation of the on/off regulatory peptide domain of Abl d) Over expression of the transcription factor Myc