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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology