Most plants have a variety of chemicals, spines, and thorns because the plants
A) cannot run away from herbivores.
B) feed on the organisms that try to eat them.
C) are camouflaged into their surroundings.
D) must rely on photosynthesis for food.
Answer: A
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According to research done by Baron, Caughey, and Prado, how do prions move within the brain?
a. They use receptors on the surfaces of nerve cells. b. They use vesicles found inside the nerve cells. c. They use tunneling nanotubes. d. They pinch off the nerve cell membrane. e. They stick to the outer surfaces of nerve cells.
?G° indicates the change in the standard free energy as a reactant is converted to product. Given what you know about these values, which reaction below is the most favorable?
(a) ADP + Pi-> ATP ?G° = +7.3 kcal/mole (b) glucose 1-phosphate -> glucose 6-phosphate ?G° = –1.7 kcal/mole (c) glucose + fructose -> sucrose ?G° = +5.5 kcal/mole (d) glucose -> CO2 + H2O ?G° = –686 kcal/mole
In cultivated stocks, the cross of a variety of white flower plants produced all red flowers in the F1
generation, but the F2 generation produced 87 red flowers, 31 cream flowers, and 39 white flowers. Explain these results by giving the genotypes possible for each phenotype. What will be an ideal response?
Once a prophage is present in a bacterial genome, viral genes are reproduced every time the bacterium multiplies. Expression of viral genes, however, is inhibited by a repressor protein. Cell stress can induce the formation of proteases that degrade the repressor. What will result?
A. The bacterium will reject the viral genes. B. The virus will enter the lytic cycle. C. The virus will enter the lysogenic cycle. D. The bacterial genome will be denatured.