Which description would be considered a scientific theory like the theory of evolution?
A) a theory about why an apple falls to the ground when dropped
B) a theory about why your neighbor has the nicest car in the neighborhood
C) a theory about which of your classmates is the source of your cold
D) a theory about why blue is your favorite color
A
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In a normal cell, tumor suppressors are responsible for (select all correct choices):
A. increasing the rate of cell division. B. correcting replication errors. C. signaling death in a highly defective cell. D. signaling the initiation of DNA replication.
Which event of fertilization occurs first?
A. fast block to polyspermy B. the entry of sperm DNA into the egg C. the slow block to polyspermy D. the acrosomal reaction E. the cortical reaction
The best way to prevent desertification is to avoid farming in areas subject to ____
a. flooding b. deforestation c. acid rain d. high winds and periodic drought e. topsoil buildup
The influenza virus can infect:a
humans b. pigs c. birds d. humans and pigs e. humans, pigs and birds