How does the Tax protein contribute to the increased growth rate of white blood cells?
a. It stabilizes the CREB dimers that bind to the CRE DNA sequence.
b. It inhibits the ability of CREB to bind to DNA.
c. It phosphorylates the CREB activator protein.
d. It allows CREB to bind the CRE-like viral enhancer.
e. It stimulates the production of cAMP in a cell.
A
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Why are telomeres a necessary component of linear chromosomes?
A. They direct where DNA synthesis will begin. B. They fix mistakes that are made during DNA replication. C. They extend the life of cells because DNA is shortened every time it is replicated. D. They direct where DNA synthesis will end. E. None of the answer options are correct.
Luria and Delbruck grew many liquid cultures of bacteria then spread a small sample of each culture on nutrient agar infused with bacteriophage in separate petri plates. They assayed the number of bacterial colonies that formed on each plate. What did the appearance of a bacterial colony on a petri plate indicate?
A) The bacterial colony was derived from one initial cell that was resistant to infection by the bacteriophage. B) The bacterial colony was made up of many cells that became resistant to bacteriophage infection independently. C) A colony formed when a bacterial cell was not resistant to bacteriophage infection. D) The bacterial cells that made up a colony were resistant to antibiotic.
In a hypothetical environment, fishes called pike-cichlids are visual predators of large, adult algae-eating fish (in other words, they locate their prey by sight). The population of algae-eaters experiences predatory pressure from pike-cichlids
Which of the following is least likely to result in the algae-eater population in future generations? A) selection for drab coloration of the algae-eaters B) selection for nocturnal algae-eaters (active only at night) C) selection for larger female algae-eaters, bearing broods composed of more, and larger, young D) selection for algae-eaters that become sexually mature at smaller overall body sizes
Projections from the cell wall of the root epidermis are called
A. root hairs B. cortex cells C. root caps D. casparian strips