Which of the following is an organelle that distinguishes between prokaryotic and eukaryotic cells?

a. the ribosomes
b. the nucleus
c. the cell wall
d. the plasma membrane


Answer: b. the nucleus

Biology & Microbiology

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How many of the following are characteristics of at least some members of the phylum Cnidaria?

1. a gastrovascular cavity 2. a polyp stage 3. a medusa stage 4. cnidocytes 5. a pseudocoelom A) 1 B) 2 and 3 C) 3, 4 and 5 D) 1, 2, 3, and 4 E) 1 and 2

Biology & Microbiology

When stimulated by the TH2 pathway, into which type of cell do B cells differentiate?

a. TH2 cells b. macrophages c. plasma cells d. eosinophils

Biology & Microbiology

A peptide bond

A) is a covalent bond between the carboxyl carbon of one amino acid and the amino nitrogen of a second amino acid. B) is a covalent bond between the functional R groups of adjacent amino acids. C) is a covalent bond between the NH group of one polypeptide and the CO group of an adjacent polypeptide that holds together multimeric proteins. D) is a noncovalent bond that dictates the tertiary structure of a protein. E) is a covalent bond between adjacent glucose molecules in a peptide.

Biology & Microbiology

Against what protein is the treatment for metastatic colon cancer Vectibix directed?

a) p53 b) VEGF c) pRB d) Her2 e) the EGF receptor

Biology & Microbiology