The D line, which is used to designate the refractive index, indicates _____.
What will be an ideal response?
Sodium lamp at 589 nm wavelength
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The main difference between therapeutic cloning and reproductive cloning is that
A. in therapeutic cloning, embryonic stem cells are extracted from the blastocyst, while in reproductive cloning, the blastocyst is kept intact and implanted into a surrogate mother. B. somatic cell nuclear transfer is used for therapeutic cloning, while gametic cell nuclear transfer is used in reproductive cloning. C. unlike cells used for reproductive cloning, cells grown for therapeutic purposes do not display genetic imprinting problems. D. unlike cells used for reproductive cloning, cells grown for therapeutic purposes do not require the destruction of embryos.
Monoclonal antibodies are useful in treating cancer when radioactive materials or tumor-killing drugs are attached to them. How is it that these cancer-killing methods are delivered only to the tumor and not to other, healthy cells?
A) Antibodies will specifically bind to the antigen target for which they are designed, here a cancer cell. B) Antibodies will attach to any cancer cell found, even if there are several different types present. C) Antibodies will stimulate the actions of T helper cells to fight the cancer. D) Antibodies will stimulate the actions of cytotoxic T cells to fight the cancer.
Which statement is incorrect about acid rain?
A. Sulfuric acid in the atmosphere is carried back to earth with rain. B. It has resulted in lakes becoming devoid of life. C. In 1989, rain and snow in the Northeast often had a pH as low as 2. D. Its effects have been more devastating to the Southeast than the Northeast. E. It comes from the tall stacks of coal-burning power plants.
Homologous chromosomes are held together by
A) a synaptonemal complex. B) centromeres. C) kinetochores. D) spindle poles. E) bouquets.