Which of the following exert bottom-up control?
A. a disease-carrying protist
B. a parasite that resides in a mammal's gut
C. levels of calcium and nitrogen in the soil
D. a tertiary predator with fluctuating population size
Answer: C
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The perception of a certain pitch of sound depends partly on
A. which bones of the middle ear are moved. B. the amplitude of the sound waves. C. whether it is the round window or oval window that vibrates. D. which hair cells of the cochlea are stimulated. E. where particles settle in the semicircular canals.
Scientists have found that extracellular matrix components may induce specific gene expression in embryonic tissues such as the liver and testes
For this to happen there must be direct communication between the extracellular matrix and the developing cells. Which kind of transmembrane protein would most likely be involved in this kind of induction? A) integrins B) collagens C) actins D) fibronectins
During the formation of an embryo, the hollow ball of cells having a fluid-filled cavity is called a
A. neurula. B. blastula. C. gastrula. D. blastocoel. E. morula.
Which of the following microscopes would be appropriately used in a hospital Tuberculosis wards?
What will be an ideal response?