Altruism involves ____, but reciprocal altruism involves ____
a. the sacrifice of an individual's reproductive success to help others; the expectation of a future favor in return
for present aid
b. aid given to nonrelatives; benefits given to close relatives only
c. the expectation of a future favor in return for present aid; close relatives helping each other
d. low-risk behavior that provides minor benefits to others; high-risk behavior providing major benefits to others
e. aid given to relatives; benefits given to nonrelatives only
ANSWER: a
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Why do you suppose cytokinesis generally occurs in the cell’s midplane?
What will be an ideal response?
Parthenogenesis refers to
a. new genetically based traits that arise spontaneously. b. traits that arise through epigenesis. c. live birth by normally egg-laying species. d. the formation of a new individual from an unfertilized egg. e. the origin of a new individual from a male
What is the structure labeled B in the accompanying figure?
A. Cytoplasm B. Nucleoid C. Plasma membrane D. Capsule E. Pilus
Organisms that are resident microbiota are best described as
A) microorganisms that remain with the person throughout life. B) any microorganisms that cause disease. C) organisms that remain in the body for a short time. D) microorganisms that may cause a disease under certain circumstances. E) microorganisms that never cause disease.