Terminally differentiated cells are noncancerous, normal cells
Indicate whether the statement is true or false
TRUE
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Which of the following statements is false?
A. The rapid depolarization phase of the action potential in pacemaker cells results from the influx of sodium through voltagegated sodium channels. B. The repolarization of the pacemaker cells following an action potential allows for the heart to relax between contractions. C. The resting membrane potential of cardiac pacemaker cells gradually becomes less negative on its own. D. Pacemaker cells repolarize by opening voltage-gated potassium channels. E. None of the answer options is false.
Hyperparathyroidism can result in nervous system impairment due to which of the following issues?
a. low sodium levels b. weak bones c. high blood calcium levels d. excess insulin
Match the microbe with an example of its importance to humans.
A. This group includes beneficial microorganisms that fix nitrogen, make antibiotics, vitamins and enzymes, as well as harmful microorganisms that cause disease such as plague and strep throat. B. Members of this group have caused "mad cow disease" and Creutzfeld Jacob disease. C. Members of this group include decomposers, associate with plant roots and help plants grow, produce antibiotics, help bread rise, and help make wine. D. Members of this microbial group cause serious diseases such as smallpox, AIDS, and Ebola fever. E. Members of this group are photosynthetic, include unicellular and multicellular forms, and are the foundation of aquatic food chains.
Which of the following is NOT a mechanism of genetic change in populations?
a) genetic drift b) mutation c) natural selection d) biogeography e) migration