PBDEs have not been linked directly to cancer in test animals
a. True
b. False
Indicate whether the statement is true or false
True
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You just discovered a new virus. This virus infects heart muscle, where it causes inflammation. This virus has a very high mutation rate. Which of the following is the best strategy for finding a treatment for this virus?
A) Develop a vaccine from living viruses. B) Identify the receptor this virus uses and develop an enzyme that blocks the receptor. C) Encourage infected individuals to engage in heart-strengthening exercise. D) Develop a drug that blocks the host's ribosomes, which the virus uses to produce its proteins.
The presence of thorns is an example of _________ defenses
A. constitutive B. induced C. chemical D. active
Which statement concerning root hairs is not correct?
A. Root hairs are tubular extensions of individual epidermal cells. B. A root hair is isolated from its epidermal cell with a cross wall. C. Root hairs generally live only a few days before being sloughed off. D. Root hairs increase the absorption of water and minerals. E. Root hairs are located in the zone of maturation of a root.
What might happen if a functional copy of the TP53 gene is not present in a cell?
a) the cell may make no p21 inhibitory protein, preventing the cell from passing the G1 checkpoint and no Bax protein, which would prevent the cell from initiation apoptosis b) all of the choices are correct c) the cell proceeds to S phase before it is ready and before DNA repairs are completed d) abnormal cells with the potential to become malignant are produced