In female mammals, the inactive X chromosome in each cell
A) can be activated if mutations occur in the active X chromosome.
B) is broken down, and its nucleotides are degraded and reused.
C) is absorbed and used in energy production.
D) becomes a Barr body.
Answer: D
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Members of the genus Pseudomonas
A. are aerobes that mineralize a wide variety of organic compounds. B. form cysts when starved for nutrients. C. perform anaerobic photosynthesis. D. are obligate intracellular parasites.
Answer the following statements true (T) or false (F)
1. In mitosis, homologous chromosomes do not pair up. 2. In meiosis, homologous chromosomes pair up, allowing crossing-over to occur. 3. If a human zygote has either 45 or 47 chromosomes, it might be assumed that this was due to nondisjunction. 4. A male having an extra X chromosome (XXY) would have Turner syndrome. 5. A female missing an X chromosome (XO) would have Turner syndrome.
Disruption of neural signaling can produce profound changes in mood and behavior. Cocaine exerts its effects by
A. blocking serotonin reuptake from synapses. B. blocking the enzyme acetylcholinesterase. C. binding to the GABA receptor to enhance inhibitory neurotransmission. D. preventing neurotransmitter vesicle fusion with presynaptic neuron membranes. E. blocking norepinephrine and dopamine reuptake from synapses.
What is the hydrogen sulfide indicator in the Lysine Iron Agar?
A. Ferric ammonium citrate B. Sodium thiosulfate C. Bromocresol purple D. Ferrous sulfate