Side chains of amino acids _____
A) are all nonpolar
B) are nonpolar if they contain N or S
C) are all polar
D) may be polar or nonpolar
Answer: D
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Asymmetry, choanocytes, filter feeding, osculum, and spicules are all terms associated with which
phylum?
a. Nematoda b. Ctenophora c. Nemertea d. Porifera e. Cnidaria
The part of the stomach designated by the letter “A”
in the above figure is called a. pyloric sphincter. b. esophagus. c. mucosa. d. duodenum. e. none of these.
What is the correct sequence of phases in mitosis?
a. anaphase ? telophase ? interphase ? prophase ? metaphase b. interphase ? prophase ? metaphase ? anaphase ? telophase c. metaphase ? anaphase ? telophase ? interphase ? prophase d. prophase ? metaphase ? anaphase ? telophase ? interphase
What best describes the tunic of a tunicate?
A. It is made of keratin, like human hair. B. It is made of chitin, like the shell of a crab. C. It is made of calcium carbonate, like the shell of a clam. D. It is made of cellulose, like the cell wall of a plant.