Which of the following never have cell walls? 

A. algae
B. animal cells
C. archaea
D. bacteria
E. fungi


Answer: B

Biology & Microbiology

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TC cells express a(n) ________ protein co-receptor

A) CD4 B) CD8 C) IgM D) IgG

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A chromosomal mutation where a segment breaks off, flips, and then reattaches itself is called a(n):

A. inversion. B. duplication. C. translocation. D. deletion. E. reciprocal translocation.

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Production of semisynthetic penicillins involves chemical modification of a penicillin product after it has been released from penicillin-producing cells.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Based on their experiment with T2 bacteriophages, Hershey and Chase concluded that

A. virulent bacteria can transform nonvirulent bacteria. B. the phage coat contains the genetic material. C. DNA replication is semiconservative. D. A always pairs with T and G always pairs with C. E. DNA functions as the genetic material.

Biology & Microbiology