In the presence of both lactose and glucose, which of the following occurs with the E. coli lac operon?
A. The lacI gene does not produce repressor.
B. The lacZ and lacY genes are fully expressed.
C. The cAMP-CAP complex is not available to bind near or at the lac promoter.
D. Lactose is converted to glucose and galactose.
E. Lactose binds to the operator.
Ans: C. The cAMP-CAP complex is not available to bind near or at the lac promoter.
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a. kill their hosts during each cycle of infection b. infect only animals c. may enter an inactive phase in which they do not kill their host d. are enveloped viruses e. infect organisms living in temperate environments
Researchers discover a pathogen that infiltrates cells and disrupts the function of the Golgi apparatus. What effect will this have on the cell?
a. The nuclear envelope will lose cohesion, spilling chromosomes into the surrounding cytoplasm. b. The cell will no longer be able to break down poisons, fatty acids, amino acids, and worn out organelles. c. Proteins and lipids from the endoplasmic reticulum will not be transported to the proper destinations. d. The cell will begin a process of rapid, uncontrolled cellular division, becoming a cancerous mass.
Each species has a unique set of ecological requirements and roles that is referred to as its ecological ____
a. habitat b. community c. requirements d. necessities e. niche
The plant physiologist F. C. Steward demonstrated that:a
the preprophase band is important in plant cell division. b. orchids can be generated from pollen grains. c. an entire plant can be generated from a single callus cell. d. the monopteros gene codes for a transcription factor. e. the shoot apical meristem gives rise to leaf and bud primordia.