Answer the following statements true (T) or false (F)
1. In the bacterium E. coli, in the absence of lactose, a repressor protein binds to the operator region of the DNA, preventing the transcription of the genes of the lactose operon.
2. In eukaryotic cells, gene expression may be controlled by not allowing mRNA to leave the nucleus.
3. A somatic mutation is a mutation that occurs in cells that give rise to gametes.
4. A bacteriophage infects a bacterial cell by injecting nucleic acid into the bacterium.
5. The components of DNA that produce an organism's genetic information are the deoxyribose nucleotides.
1.TRUE
2.TRUE
3.FALSE
4.TRUE
5.TRUE
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Phorid flies are being used to combat the invasive red imported fire ants. How do phorid flies kill the ants?
a. They are predators of the ants. b. They produce a poison in their lining which kills the ants when eaten. c. They are parasitoids who lay their eggs in the ants body. d. They compete with the ants for food sources. e. They kill ant eggs.
The genetic material of some viruses, such as HIV, is not DNA but is instead
A) carbohydrate. B) lipid. C) RNA. D) protein.
The characteristic that makes the muscle cells unique is the relative abundance and organization of
A. collagen fibers. B. actin and myosin fibers. C. keratin fibers. D. gelatinous mass. E. fibroblast cells.
Which of the following statements pertaining to changes in the global economy of the 21st century is true?
A) Barriers to the free flow of goods, services, and capital have increased B) volume of global output has been growing more rapidly than cross-border trade and investment C) National economies are becoming more independent D) the world is moving toward an economic system that is more favorable for international business