The tubular structure that moves food by peristalsis from the mouth to the stomach is the
A. trachea.
B. tongue.
C. epiglottis.
D. glottis.
E. esophagus.
Answer: E
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Basic microbiology can be used to
A) probe the fundamental processes of life. B) study characteristics of cells of multicellular organisms. C) model our understanding of cellular processes in multicellular organisms, including humans. D) probe the fundamental processes of life, study characteristics of cells of multicellular organisms, and model our understanding of cellular processes in multicellular organisms, including humans.
A scientist wants to study histones. Histones are:
A. proteins that double-stranded DNA molecules wrap around in prokaryotes and eukaryotes. B. proteins that double-stranded DNA molecules wrap around in eukaryotes. C. proteins that required for the activity of Cdk enzymes. D. proteins that regulate checkpoints in the mitotic cell cycle. E. proteins that serve as the spindle fiber to pull sister chromatids apart during anaphase.
A genetic sex disorder that affects females only and consists of missing an X chromosome is known as ________
Fill in the blank(s) with the appropriate word.
Which is an example of a density-independent factor on a population?
A. Weather B. Amount of prey C. Intraspecific competition D. Nesting sites E. Predation