Which phylum is most closely related developmentally to the first vertebrates?

A. Echinodermata
B. Arthropoda
C. Mollusca
D. Annelida
E. Chelicerata


Answer: A

Biology & Microbiology

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One of the most common causes of mental retardation in the United States is

a. congenital rubella syndrome. b. cocaine addiction. c. fetal alcohol syndrome. d. use of thalidomide by pregnant women. e. use of tetracycline by pregnant women.

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The major difference between the smooth and rough ER is that ____

a. smooth ER is isolated to the nucleus b. vesicles are found only in the smooth ER c. rough ER contains ribosomes d. smooth ER is the site of polypeptide synthesis e. rough ER is the site of lipid synthesis

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A monosaccharide is a

a) carbohydrate b) lipid c) nucleic acid d) protein

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What is hydrolysis?

What will be an ideal response?

Biology & Microbiology