What is the correct ordering in the hierarchal levels of the organization of life, from the least inclusive to the most inclusive?
A. Atoms, tissues, cells, organs, and organisms
B. Molecules, cells, organs, tissues, and organisms
C. Ecosystems, populations, tissues, cells, and organs
D. Cells, tissues, organs, communities, and populations
E. Cells, tissues, organs, organisms, and ecosystems
Answer: E
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Imagine that several thousand years ago, a group of bats and a group of frogs colonized an island at the same time. What can you expect of their current descendants?
A. There will be more frog species compared to bat species. B. There will be more bat species compared to frog species. C. The number of bat and frog species will be equal. D. All frog species will have become extinct on the island. E. All bat species will have become extinct on the island.
The principle of independent assortment states that:
1.One allele is always dominant to another. 2.Hereditary units from the male and female parents are blended in the offspring. 3.The two hereditary units that influence a certain trait segregate during gamete formation. 4.Each hereditary unit on one chromosome is inherited separately from hereditary units on other chromosomes. 5.Genes on the same chromosome travel separately.
The expression of a given gene may be influenced by
a) Activating transcription factors b) Enhancer sequences c) Histone modifications d) All of the above
Cerebrospinal fluid circulates in the ________ to deliver nutrients to the brain and spinal cord
A) dura mater B) arachnoid villi C) cranial sinuses D) subarachnoid space E) pia mater