George is 16 years old and really wants to make the high school basketball team. Although he is skilled, he is only 5 feet, 10 inches tall. What advice would you give him about taking human growth hormone?
What will be an ideal response?
Human growth hormone is expensive, may have negative effects in the long term, and is not approved by the FDA for the use he is contemplating. If he were to continue to take the hormone, he could end up with acromegaly. Additionally, he should check to see that his bones can continue to lengthen because some teenagers have already achieved all of their possible height by this time.
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Which of the following is the meaning of the chromosome theory of inheritance as expressed in the early twentieth century?
A) Individuals inherit particular chromosomes attached to genes. B) Mendelian genes are at specific loci on the chromosome and, in turn, segregate during meiosis. C) Homologous chromosomes give rise to some genes and crossover chromosomes to other genes. D) No more than a single pair of chromosomes can be found in a healthy normal cell. E) Natural selection acts on certain chromosome arrays rather than on genes.
Transfer of genetic information via direct cell-cell contact is called
A. transduction. B. transformation. C. transfection. D. conjugation.
In flowering plants, how many egg cells are typically produced from each megaspore mother cell?
a. one b. two c. three d. four e. eight
M. J. Berkeley demonstrated that the great potato blight of Ireland was caused by a fungus.
Answer the following statement true (T) or false (F)