Because they lack well-defined and complex organ systems, we hypothesize that ___ diverged from other animals
A. poriferans
B. cnidarians
C. choanoflagellates
D. bilaterians
B
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Class I MHC proteins have grooves with open ends
Indicate whether the statement is true or false.
Primary treatment of sewage involves the use of which type of process?
A. Physical/chemical removal of insoluble particulate materials B. Biological removal of inorganic nutrients C. Virus removal/inactivation D. Biological removal of dissolved organic matter
A bacterial mismatch repair system is able to correct replication errors that insert an incorrect nucleotide. How is this repair system able to determine which mismatched base is incorrect?
A) The incorrect base results in a bulge on only the new strand. B) The incorrect base is in the parental strand which is modified with methyl groups. C) Some bases of the parental strand are methylated, while none of the new strand are. D) A methyl group is attached to the incorrect base in the newly synthesized DNA strand. E) DNA polymerase is bound to the new strand at the location of the incorrect base.
Chromatin that contains sequences that are not transcribed in any cell type is called
a. constitutive heterochromatin. b. facultative heterochromatin. c. constitutive euchromatin. d. facultative euchromatin.