The greenhouse effect causes an increase in global temperatures. This increase is due primarily to ________
A) CO2 and other greenhouse gases allowing more solar radiation to penetrate Earth's surface
B) CO2 and other greenhouse gases slowing the escape of UV radiation from Earth
C) the loss of ozone that trapped cooling UV radiation in the atmosphere
D) CO2 and other greenhouse gases slowing the escape of heat from Earth
D
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Hexaploid wheat was produced synthetically by He and co-workers. They mated the diploid species, Aegilops tauschii, and the tetraploid species, T. turgidum. Which of the following is an accurate statement about the relative contribution of each parent
to the genome of the hexaploid offspring? A) Each parent contributed equally to the genome of the offspring. B) Aegilops tauschii contributed four chromosomes by failing to complete meiosis after chromosome replication, and T. turgidum contributed two chromosomes. C) Aegilops tauschii contributed two sets of chromosomes, and T. turgidum contributed four sets of chromosomes. D) The hexaploid number appeared following mitosis with no subsequent cell division.
Which animal group is characterized by the absence of tails?
A) apes B) Old World monkeys C) New World monkeys D) lemurs
Which statement best describes the difference between therapeutic and reproductive cloning?
A) Therapeutic cloning involves producing medications, whereas reproductive cloning is used for in vitro fertilization procedures. B) Therapeutic cloning is used to produce stem cells that can be coerced into differentiating into a specific cell type, whereas reproductive cloning is used to produce organisms identical to what they were cloned from. C) Therapeutic cloning produces cells that are not genetically identical to their source, whereas reproductive cloning produces cells that are genetically identical to their source. D) There really aren't any differences between therapeutic and reproductive cloning.
Which of the following statements about type I reactions is FALSE?
A) They involve helper T cells. B) They involve IgE antibodies. C) The symptoms are due to histamine. D) Antibodies bind to mast cells and basophils. E) The symptoms occur soon after exposure to an antigen.