Demographics include __________ and __________ structure, such as the size of the __________
base. Fill in the blank(s) with the appropriate word(s).
population size; age; reproductive
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During DNA replication, all of the following proteins are important for separating the DNA strands and allowing movement of the replication fork EXCEPT
A. DNA polymerase. B. helicase. C. topoisomerase. D. single-stranded binding proteins. E. both helicase and topoisomerase.
Why can an infection in the brain's ventricles usually be detected in spinal fluid obtained from the lower back (lumbar region)?
A. Cerebrospinal fluid (CSF) originates in the ventricles, but percolates over and around the brain and spinal cord. B. There is a high degree of vascularity that exists, allowing easy transfer of bacteria in the cerebrospinal fluid (CSF) and the blood. C. There is a set of lymph nodes specifically in place to drain the cerebrospinal fluid (CSF) from the ventricles. They are housed in the lumbar region of the spinal column, adjacent to the spinal cord. D. This is an incorrect statement. Since the central nervous system (CNS) is a protected site due to the blood-brain barrier, there can never BE an infection in the ventricles.
Nitric oxide (NO) is considered a paracrine signal molecule because it
a. is slow to diffuse. b. is produced in very small quantities. c. is unstable, with a short half-life. d. binds to cell surface receptors that are very plentiful.
Which term describes the concept that no two species can have the same "job" in the community at the same time?
a) competitive exclusion b) symbiosis c) habitat d) mimicry e) density-dependent factor