A drug is tested in the laboratory and is found to create holes in both mitochondrial membranes. Scientists suspect that the drug will be harmful to human cells because it will inhibit
A) the citric acid cycle only.
B) oxidative phosphorylation only.
C) glycolysis only.
D) the citric acid cycle and oxidative phosphorylation.
Answer: D
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Answer the following questions true (T) or false (F)
1. Zoonotic diseases are spread from animals to humans. 2. The source of an infectious agent is the animate or inanimate habitat where the pathogen is naturally found. 3. The acute phase of an infectious disease, when the pathogen levels are the highest, is the most contagious stage of any pathogen.
The type of inheritance that would suggest the concept of blending is
a. multiple alleles. b. autosomal dominance. c. codominance. d. incomplete dominance. e. codominance and incomplete dominance.
Positive and negative transcriptional regulation differ in that:
A. positive regulation requires that a promoter be present; it's not necessary in negative regulation. B. in positive regulation, the binding of a regulatory protein to the DNA is necessary for transcription to occur; in negative regulation, no such protein is necessary. C. in positive regulation, the binding of a regulatory protein to the DNA is necessary for transcription to occur; in negative regulation, such binding prevents transcription. D. in positive regulation, the absence of a regulatory protein promotes transcription; in negative regulation, the absence of a regulatory protein promotes transcription. E. None of these choices is correct.
Which of the following statements about lichens is incorrect?
A. Lichens are symbiotic relationships between fungi and plants. B. The partnership in a lichen is not species specific. C. Lichens can reproduce sexually and asexually. D. Lichens can extract nutrients from rocks or rainfall. E. Lichens are very sensitive to air pollution.