The large size of poxviruses allows them to
A) be easily isolated in infected cells.
B) attach to both animal and human cells.
C) provoke a strong immune response in the host.
D) travel in droplets.
E) be potential vectors for genetic engineering of vaccines.
E
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Which of the following is NOT true concerning mitosis?
A. It insures the immortality of the genetic information possessed by an organism. B. The DNA molecule replicates before any chromosomes can be seen. C. It is the process that heals a wound. D. It accounts for most of the increase in size of growing plants and animals.
What is the biological risk of using salt on icy roads in parts of the country that have a cold winter season?
a. Plant root cells will grow in excess to try to reach fresh water. b. Plant cells will take on excess water from the melted ice and become turgid. c. Salt is in limited supply in the ecosystem and this type of overuse will make it even more so. d. The salt has the risk of leeching into the ground and creating a hypertonic environment for plant cells.
Group A streptococci are considered more virulent if their cytoplasmic membrane contains M protein
Indicate whether the statement is true or false
Which of the following statements about plant tissue culture is false?
A. A callus is a mass of undifferentiated cells. B. Callus tissue can only form roots, not shoots. C. Synthetic hormones can be used to selectively promote root or shoot formation. D. Individual cells can give rise to whole plants through tissue cultures. E. Virus-free crop species can be propagated by culturing meristems.