Over many generations man has chosen certain desirable characteristics in dogs by allowing dogs possessing those characteristics to reproduce. In this way, 150 breeds of dogs, all the same species, have descended from wolves. This process is referred to as
A. convergent evolution.
B. natural selection.
C. inheritance of acquired traits.
D. artificial selection.
Answer: D
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Which of the following highly contagious viruses is a single-stranded ribonucleic acid (RNA) virus with a helical capsid and envelope and is transmitted by coming in contact with respiratory secretions?
a. Coxsackievirus A b. Rhinovirus c. Parvovirus d. Measles
When male moose engage in their annual battles, butting heads with their oversized antlers, they are exhibiting ____
selection.
a. stabilizing b. disruptive c. directional d. intrasexual e. intersexual
Which hormone is secreted by alpha cells of the pancreas in response to hypoglycemia?
A. glucagon B. insulin C. glucose D. cortisol E. glycogen
A number of different types of microscopy exist. Each type of microscopy has advantages and disadvantages. Can you identify the microscope that would be most advantageous for the situations below?
a. A cell biologist wishes to visualize the ribosomes of a cell. b. A microbiologist wishes to examine the motility of a bacterium. c. An immunologist wishes to determine if a lymphocyte possesses a certain surface protein. d. A virologist is trying to determine the three-dimensional shape of a virus. e. A pathologist is trying to examine the cytoplasm of a cell for changes that result from viral infection. What will be an ideal response?