What are some of the benefits of transferring genes from one organism to another?
What will be an ideal response?
First of all, we can get bacteria to mass-produce human proteins, such as the hormone insulin, that can be used to treat human diseases. Since the protein makes use of a human gene, it matches precisely that which would normally be produced in the human body. Second, many beneficial agricultural advances will surely come from gene transfers. For example, pest resistance in plants will lessen the need for pesticides that are costly and pollute the environment.
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Which type of reproduction is most adaptive in a rapidly changing environment with many different parasitic diseases present?
A. sexual reproduction, because the diversity of genotypes increases the likelihood that there is one which can survive in a new environment B. asexual reproduction, because the currently successful genotypes can reproduce quickly C. asexual reproduction, because asexual reproduction uses less energy, which leaves more for each individual to adapt to the changing environment D. sexual reproduction, because this type of reproduction allows the production of a greater number of offspring, thus providing more individuals to take advantage of any environmental challenges presented
Which of the following is not true about cervical cancer, which is a relatively common cancer?
a. It can be detected early by a PAP test. b. It is usually caused by human papillomavirus (HPV). c. It causes the cervical cells to make peptide E7, which disrupts the cell cycle. d. It spreads by blocking the retinoblastoma protein RB. e. It usually remains localized.
In an ecosystem, energy
A) cycles along with chemical nutrients.
B) typically flows from consumers to producers to decomposers.
C) typically flows from producers to a series of consumers.
D) comes ultimately from bacteria.
A zygosporangium is produced by
A) the union of two haploid hyphae. B) meiosis of megaspores. C) mitosis of hyphae. D) the union of egg and sperm. E) meiosis of hyphae.