What are the sensory structures that enable invertebrates to determine the orientation of the body with respect to gravity called?
A. carotid bodies
B. statocysts
C. Ruffini endings
D. baroreceptors
E. interoceptors
B. statocysts
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Sexual reproduction in eukaryotes increases genetic variation. In prokaryotes, transformation, transduction, and conjugation are mechanisms that increase genetic variation
A fundamental difference between the generations of genetic variation in the two domains is: A) Eukaryotes are able to generate mutations in response to environmental stress while prokaryotes only generate random variation. B) Eukaryotic variation occurs primarily within a single generation while prokaryotic variation occurs over many generations. C) Crossing over is a major mechanism in creating genetic variation in prokaryotes while independent assortment is a major mechanism is eukaryotes. D) Eukaryotic genetic variation occurs with vertical gene transfer while prokaryotic genetic variation occurs with horizontal gene transfer.
Viruses differ from cells in that viruses
A) are alive. B) contain DNA or RNA, but not both. C) only reproduce asexually. D) have more genes.
Within the ocean, temperature gradients occur in the water column. Which best describes how temperature variations affect the nutrient levels at the surface?
A) Nutrients are decreased near the surface because upwellings force nutrient-rich water towards the warmer bottom and nutrient-poor water to the colder surface. B) There are always many more nutrients at the warmer surface than in the colder deeper water. C) The nutrient level at the surface is not affected by temperature variations. D) Nutrient levels at the surface increase because upwellings force nutrient-rich water from the colder bottom to the warmer surface.
The lower respiratory tract is protected by all of the following EXCEPT
A) competition with the normal flora of the lungs. B) IgA antibodies. C) mucous secretions. D) the ciliary escalator. E) alveolar macrophages.