Which layer of the digestive tract gives rise to sphincters?
a. mucosa
b. circular muscle
c. longitudinal muscle
d. submucosa
e. serosa
ANSWER: b
Biology & Microbiology
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When the chromosomes line up in mitosis this is known as which phase?
A. Telophase B. Anaphase C. Metaphase D. Prophase
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Allele frequency can be measured using what technique?
A. observation of phenotype B. gel electrophoresis C. DNA sequencing D. All of the answer options are correct. E. None of the answer options is correct.
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The major abiotic reservoir for phosphorus is ________
A) the oceans B) the atmosphere C) rock D) dead organic matter
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Which of the following supports the chordate body and is the first feature of the skeleton to form?
a) dorsal nerve cord b) notochord c) series of pharyngeal slits d) muscular, post-anal tail
Biology & Microbiology