These structures are required for chromosome replication; they protect the chromosome from being destroyed by dangerous DNAase enzymes, and they keep chromosomes from bonding to one another end to end.
A. telomeres
B. nucleoproteins
C. histones
D. nucleotides
A. telomeres
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How long does it take for a biofilm to form?
a. seconds to minutes b. minutes to hours c. hours to days d. days to months e. months to years
The promotion of the lactose operon in
bacteria is a. activated by a repressor protein. b. independent of glucose concentration. c. activated by t lactose binding. d. regulated by RNA polymerase. e. none of these
Which of the following statements BEST explains the observation that there are more autism cases now than in the past?
a. There are more parents who neglect their children, which is a cause of autism, now than in the past. b. Autism has been selected for in recent generations by natural selection. c. The vaccine for measles, mumps, and rubella has been established as a significant cause of autism. d. Doctors are more aware of the condition and have better techniques for diagnosing and reporting it. e. All of the above are equally good explanations for the observation that there are more autism cases now than in the past.
The cell-cell interactions mediated by the selectins, integrins, and most members of the Ig superfamily are _______ interactions in which the cytoskeletons of adjacent cells are not linked to one another.
a. nonspecific b. physiologically unimportant c. stable d. transient