The positive control of the lactose operon in bacteria

is
a. activated by a repressor protein.
b. independent of glucose concentration.
c. activated by allolactose
d. regulated by RNA polymerase.
e. none of these.


Answer: c

Biology & Microbiology

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Using the great lubber grasshopper as a model, Walter Sutton observed:

A. separation of maternal and paternal chromosomes during mitosis. B. replication of chromosomes during meiosis. C. crossing over of homologous chromosomes. D. pairing of homologous chromosomes during mitosis. E. pairing of homologous chromosomes during meiosis.

Biology & Microbiology

Which of the following is NOT true about

cyanobacteria? a. Cyanobacteria have the same lightcapturing chlorophylls as plants. b. Chloroplasts evolved from ancient cyanobacteria. c. Cyanobacteria can fix carbon. d. Cyanobacteria can fix nitrogen. e. Cyanobacteria put nearly all of the nitrogen into Earth’s atmosphere

Biology & Microbiology

Four of the five nitrogen-containing bases listed

below are bases used to construct DNA. Select the exception. a. cytosine b. adenine c. thymine d. guanine e. uracil

Biology & Microbiology

Gene that codes for a protein that ordinarily suppresses the cell cycle; inactivity due to a mutation can lead to a tumor.

What will be an ideal response?

Biology & Microbiology