In eukaryotes, where does transcription take place?
A) In the cytoplasm
B) Anywhere in the cell
C) In the nucleus
D) In both the cytoplasm and nucleus
E) In the mitochondria
C
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The osmoregulatory and ionoregulatory problems facing a freshwater fish are
A. loss of water and loss of ions. B. loss of water and gain of ions. C. gain of water and loss of ions. D. gain of water and gain of ions. E. loss of urine and gain of ions.
Which of the following does NOT involve K+?
a. repolarization b. hyperpolarization c. depolarization d. resting membrane potential e. dampening of neural activity
People with the genetic disease xeroderma pigmentosum have compromised DNA repair mechanisms, making them extremely sensitive to genetic damage from sunlight
Without taking measures to minimize exposure, these individuals typically succumb to skin cancer in childhood or early adulthood–a demonstration of the mutagenicity of ultraviolet radiation. Yet, deliberate exposure in the form of sunbathing is very popular with some segments of the population. Why do you think this is so, and how might public health professionals raise awareness of the danger in which these people place themselves?
The MHC (major histocompatibility complex) is NOT important in
A. presenting antigenic determinants. B. recognizing infected cells. C. identifying bacterial pathogens. D. identifying abnormal cells. E. distinguishing self from non-self.