Viruses can redirect host metabolic functions
Indicate whether the statement is true or false.
Answer: TRUE
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Which of these statements INCORRECTLY describes an example of pleiotropy?
A. A mutation in a Cl-transport protein causes infertility and excessive mucus in the lungs. B. A mutation in a gene for microtubule formation causes a defect in sperm motility and cilia movement in the respiratory tract. C. A mutation in a lipid metabolism gene leads to a buildup of lipids in cells, causing blindness and paralysis. D. A mutation in the phenylalanine hydroxylase gene can cause mental retardation and loss of motor skills. E. A mutation in one allele for phenylalanine hydroxylase results in lower levels of this enzyme in the blood, which causes high blood levels of phenylalanine.
When molt-inhibiting hormone is prevented from being secreted
a. ecdysone levels increase. b. ecdysone levels decrease. c. molting is inhibited. d. growth is inhibited. e. growth is stimulated.
If cells in the process of dividing are subjected to colchicine, a drug that interferes with the formation of the spindle apparatus, at which stage will mitosis be arrested?
A) anaphase B) prophase C) telophase D) metaphase E) interphase
Which force pushes water into the xylem as osmosis moves water into the root?
A. guttation B. root pressure C. atmospheric pressure D. transpiration E. water stress