Sphincters
a. are circular muscles.
b. prevent backflow.
c. are smooth muscles.
d. are found at the entrance and exit of the
stomach.
e. include all of these
E
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14Cis a radioactive isotope, and it turns into ____________________ when it decays
Fill in the blank(s) with the appropriate word(s).
What species of Rhizopus may infect people who
have a weakened immune system? a. R. oryzae b. R nigicans c. R. stolonifer d. R. arrhizus e. any of these
A well-substantiated explanation of some aspect the natural world, based on a body of facts that have been repeatedly confirmed through observations and experiments, is referred to as a(n) ________
A) idea B) hypothesis C) theory D) fact
What statement about homeotic genes, as it relates to morphogenesis in Drosophila, is NOT true?
A. Homeotic genes code for translational factors that bind to mRNA. B. The homeobox codes for a homeodomain which is the DNA-binding portion of the transcriptional factor. C. Each homeotic gene has a variable region and a sequence called the homeobox. D. Homeotic genes are found in many different organisms. E. All homeotic genes are thought to be derived from an original DNA sequence that has been highly conserved in evolution.