Outline three properties of genes for which the Watson–Crick model offers an explanation. What will be an ideal response?
ANSWER: First, genetic information is stored in the sequence of bases in the DNA. Second, the model
explains how any change in the linear sequence of bases in DNA can result in a mutation that
produces an altered phenotype. Last, the complementary sequences of the two strands
explains how DNA is copied before each cell division.
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Red imported fire ants are an invasive species in United States. How have they harmed the Texas horned lizard, which feeds on native ants?
a. They act as parasites on the lizards. b. They are poisonous to the lizards. c. They damage the lizard's breeding area. d. They increase the amount of predatory birds, which eat lizards. e. They have replaced many native ant populations, so the lizards have less food.
Which of the following substances stimulates contractions in uterine smooth muscle during labor?
A) progesterone B) estrogen C) oxytocin D) prolactin
The pattern of embryonic development in which only the cells lacking yolk subsequently undergo cleavage is called _____
A) holoblastic development, which is typical of marsupial mammals B) meroblastic development, which is typical of humans C) holoblastic development, which is typical of amphibians D) meroblastic development, which is typical of birds
The targeting of specific sequences in the DNA for removal or replacement is best described as
A. genomics. B. proteomics. C. gene therapy. D. genome editing. E. cloning.