Which of the following shows the steps of a viral infection in the proper order?
A) virus locates host cell ? enters nucleus ? alters host cell DNA ? destroys cell membrane
B) virus locates host cell ? alters host cell DNA ? host cell produces copies of virus ? copies enter host cell nucleus ? nucleus leaves cell
C) virus locates host cell ? penetrates cell membrane ? enters nucleus ? alters host cell DNA ? host cell produces copies of virus
D) virus locates host cell ? forms hydrogen bonds ? changes DNA to RNA? host cell produces copies of virus
Answer: C
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Which of the following is (are) true in plants? I) Mitosis occurs in gametophytes to produce gametes. II) Meiosis occurs in sporophytes to produce spores. III) The gametophyte is within the flower in angiosperms
A) only I B) only II C) only III D) only I and II E) I, II, and III
What does one call a mutation that occurs in a DNA sequence, but leaves the resulting amino acid sequence unchanged?
What will be an ideal response?
In animals that take in oxygen from their environment, glucose is broken down into carbon dioxide and water in a process called
A. anaerobic respiration. B. glucose respiration. C. aerobic respiration. D. organic compound respiration.
In individuals with cystic fibrosis:a
the mucus enhances the action of the cilia that line the bronchi. b. the mucus prevents the growth of dangerous bacteria in the respiratory system. c. the mucus in the respiratory system is thinner than in unaffected individuals. d. abnormal mucous secretions occur throughout the body systems. e. abnormal mucous secretions inhibit infections by bacteria.