Which of the following is not a hypothesis for the origin of viruses?
a. Viruses are escaped selfish genetic elements.
b. Viruses are the remnants of parasitic cellular organisms selected for a reduction in size.
c. Viruses are relics of the RNA world.
d. Viruses are escaped genes from modern genetic engineering experiments.
D
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Which bird is a social parasite and lays its eggs in the
nests of other birds? a. catbird b. cowbird c. magpie d. Kirtland warbler e. blue jay
A neurologist diagnoses a patient with damage to the hippocampus. This observation is consistent with the difficulties the patient reports with
A. effectively coordinating movements once initiated. B. maintaining a steady and regular heartbeat. C. planning movements. D. forming memories of recent events. E. perceiving tactile stimulation from different regions of their body.
The physical appearance of an organism is called its _______ which is determined by _______.
A: genotype; its phenotype B: phenotype; its genotype C: phenotype; its environment D: phenotype; genotype and environment E: character state; its specific traits
Which of the following events could cause a plant that normally grows in a sunny habitat to dramatically elongate its stem?
a) The plant was watered. b) The plant was exposed to a high level of far-red light. c) The plant was exposed to blue light. d) The plant was not exposed to far-red light.