The host range of a virus is determined by _____
A) the enzymes carried by the virus
B) whether its nucleic acid is DNA or RNA
C) the proteins in the host's cytoplasm
D) the proteins on its surface and that of the host
D
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You are a genetic counselor, and a couple comes to you with concerns that if they have a child together, he or she
could have hemophilia. The woman has an X-linked recessive form of hemophilia, but the man does not. How should you advise them?
a. Half of their children will have hemophilia.. b. All of their sons and half of their daughters will have hemophilia. c. None of their children will have hemophilia, but all of their daughters will be carriers for hemophilia. d. Each of their sons will have a 50% chance of having hemophilia, and each of their daughters will have a 50% chance of being carriers. e. All of their sons will have hemophilia, and all of their daughters will be carriers.
With the use of effective vaccines, polio has
become a very rare disease and far fewer people get polio than once did. This is an example of ____ selection
a. directional b. stabilizing c. disruptive d. mutational e. infrequent
The chemical elements that are available to producers are usually in what form?
a. ions b. gases c. solids d. compounds e. hydrocarbons
Which of the following statements is true?
A) The shortest wavelength of light is the ultraviolet ray, which is the highest in energy. B) The longest wavelength of light is the ultraviolet ray, which is the highest in energy. C) The longest wavelength of light is the infrared ray, which is the highest in energy. D) The shortest wavelength of light is the infrared ray, which is the highest in energy. E) The shortest wavelength of light is the visible light, which is the highest in energy.