An adult patient has just received a diagnosis of brain cancer and is undergoing treatment. Based on what you know about cell division and cancer, why does this seem unusual?
What will be an ideal response?
In adults, neurons typically do not undergo mitosis. Given that cancer is uncontrolled mitosis, it seems odd that neurons would become cancerous. Thus, it must be the glial cells of the central nervous system that are cancerous.
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Both animals and fungi are heterotrophic. What distinguishes animal heterotrophy from fungal heterotrophy is that most animals derive their nutrition by _____
A) preying on animals B) ingesting it C) consuming living, rather than dead, prey D) using enzymes to digest their food
On a dare, a student challenges another student to lick a California newt (Taricha torosa). From which population of newts should the student grab an individual to reduce his or her risk of a toxic dose?
A) from a population with no garter snakes B) from a population with a low abundance of garter snakes C) from a population with a medium abundance of garter snakes D) from a population with a high abundance of garter snakes
In __________ selection, individuals with a phenotype near the mean are favored over those at the
phenotypic extremes. a. directional b. disruptive c. stabilizing d. frequency-dependent e. natural
Sound is "heard" when sound waves cause structures inside your ears to physically vibrate. A signal is then sent to your brain where it is interpreted as sound. What type of receptor in the ear is responsible for the sense of hearing?
A) Chemoreceptors B) Electromagnetic receptors C) Mechanoreceptors D) Thermoreceptors