If a portion of the pancreas is surgically removed from a rat and the rat subsequently loses its appetite, one explanation is that the removed portion contains cells that secrete a chemical signal that somehow stimulates appetite
Given this scenario, what type of chemical signaling is occurring?
A) autocrine
B) paracrine
C) endocrine
D) neuroendocrine
C
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A cell with 36 chromosomes undergoes meiosis. The end result is ____________________
a. two cells with 36 chromosomes b. four cells with 36 chromosomes c. two cells with 18 chromosomes d. four cells with 18 chromosomes
Frequency of an X-linked recessive allele in males equals
A) p2. B) 2pq. C) q2. D) q.
Which of the following is a natural process of plants that can be used by humans to remove toxins from soils? Check all that apply.
A. physiological breakdown of the chemical into harmless products B. transport of toxins absorbed by the roots into the shoots, where they can be collected more easily C. root pressure pushing toxins from deep in the soil towards the surface D. secretion of a substance from the roots that breaks down the toxic chemical E. "storage" of a toxic chemical in plant tissues, which are then removed from the site
Which of the following is NOT an example of variation?
A) cats can have long or short fur B) both monocotyledons and dicotyledons perform the dark reaction C) a child does not have her mother's hair color D) giraffes have not been seen in an albino form E) lobsters can come in many colors including blue, read, and brown