Describe the lysogenic cycle of a bacteriophage and/or a prophage. Why do you think it would be useful to the virus to have this cycle?
What will be an ideal response?
Answers may vary. In the lysogenic cycle, after attachment and penetration, the viral DNA integrates into the host cell genome. It is passed on to daughter cells as the host cell reproduces. In this manner, the virus can "silently" infect millions, even billions of cells, with no negative repercussions. With a stimulus, like UV radiation or depressed immunity, the lysogenic phase may enter the lytic phase. The lytic cycle may result in host cell lysis and death. If budding occurs, and there is a heavy viral load, the cell will be negatively affected and will usually die. So, the lysogenic phase ensures the spread of the virus into additional cells without causing cell death.
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The digestive system of molluscs is found in the:
a. head. b. foot. c. mantle. d. visceral mass. e. mantle cavity.
DNA microarrays (DNA chips) are used to ____
A. cut DNA molecules at specific sites B. clone DNA C. test an individual for a specific genetic disease D. screen an individual's entire genome E. produce human embryos in a laboratory dish
Assume that a species has a diploid chromosome number of 24. The term applied to an individual with 25 chromosomes would be triploid
Indicate whether the statement is true or false
Formation of a retinoblastoma eye tumor requires:
A. A germinal mutation in one Rb allele B. A somatic mutation that turns on the Rb gene C. A germinal mutation in one Rb allele, then a somatic mutation in the other allele D. A germinal mutation in the dominant Rb allele E. Activation of the X-linked oncogene Rb