Body temperature can rise when a pathogen has infected the body. This high temperature is called a fever. How does a fever help protect the body?
A) The higher temperature promotes bacterial growth.
B) The higher temperature promotes synthesis of important cellular enzymes.
C) The higher temperature promotes virus replication.
D) The higher temperature inhibits the reproduction of bacteria
Ans: D) The higher temperature inhibits the reproduction of bacteria
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Some virus shapes that infect members of Archaea are unique from other viruses that infect eukaryotes and bacteria
Indicate whether the statement is true or false.
Which of the following is true of both first- and second-division nondisjunction? (Choose all that apply)
A. Gametes are produced with extra chromosomes B. Gametes are produced with missing chromosomes C. Sister chromatids fail to separate D. Homologous chromosomes fail to separate E. Half of the gametes produced are wildtype, while half are mutated
Which of the following statements about the electron transport chain in cell respiration is CORRECT?
A. Electrons move from NADH to a chain of proteins with lower electronegativities. B. The electron transport chain of proteins uses ATP to pump H+ across the inner mitochondria membrane against its electrochemical gradient. C. The loss in free energy of the electron initially donated by NADH is used to transport H+ across the inner mitochondrial membrane against its electrochemical gradient. D. The electron transport chain of proteins contains pores that are leaky to H+. E. The ATP synthase pump generates a H+ gradient across the inner mitochondrial membrane.
At the end of the Permian period a large mass extinction occurred; 90-95% of the marine and terrestrial species were eliminated. Which of the following are thought to be the possible cause(s) of this mass extinction?
A. Glaciation. B. Meteorites colliding with the Earth. C. Volcanic eruptions. D. Competition between marine and terrestrial animals. E. Glaciation or volcanic eruptions.