Some mutations can be corrected using enzymes found in the cell.
a. true
b. false
Ans: a. true
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While observing a new species of seaweed under the microscope, it becomes apparent that the entire organism is one large cell containing several nuclei. Which of the following best describes the organization of this organism?
A. coenocytic B. complex multicellular C. simple multicellular D. filamentous E. eukaryotic
A strain of penicillin-resistant N. gonorrhoeae that does not have a plasmid is isolated. A lysate made from the bacterium cannot degrade penicillin in an in vitro assay. When a culture of this strain is grown in a solution that contains radioactive penicillin, the amount of penicillin found within cells is less than the amount found within cells from a nonresistant strain. The DNA sequence of the porin gene from the resistant strain does not have any mutations. What is the most likely mechanism of resistance in this strain?
A) A mutation in the mtr gene has occurred, resulting in fewer efflux pumps. B) A penA nonsense mutation has occurred. C) A penA missense mutation has occurred. D) The bacterial genome carries the penr gene.
Food moves through the digestive system with the aid of ________, special muscular contractions of the food tube.
Fill in the blank(s) with the appropriate word(s).
Answer the following questions true (T) or false (F)
1. Damage to the medulla oblongata in the brain could interfere with breathing. 2. The human body has more sensory input to the CNS than the traditional "five senses." 3. If the left side of the body is paralyzed by a stroke or other brain injury, the damage occurred on the left side of the brain.