Signals from motor neurons result in action potentials in muscle fibers, which in turn causes the __________ to
release stored calcium ions. Fill in the blank(s) with the appropriate word(s).
ANSWER: sarcoplasmic reticulum
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Why do vertebrates have more individual Hox genes than most invertebrates, and what is the general
significance?
What will be an ideal response?____ are phagocytes that engulf bacteria and cellular debris
a. Eosinophils b. Leucocytes c. Monocytes d. Platelets e. Neutrophils
Natural selection can only act on traits that
a) are adaptive b) reduce mortality c) are heritable d) are acquired in an individual's lifetime e) confer a reproductive advantage
Which of the following is correct about polio?
A. The Sabin vaccine is preferred over the Salk vaccine in the U.S. today. B. The disease is spread by the respiratory route. C. The oral polio vaccine (OPV) is not responsible for causing any polio. D. The virus multiplies in the mucosa of the intestines and is shed in feces. E. The disease is still affecting millions of people worldwide, mainly in Africa and India.