Which of the following is NOT a description of one group of archaea?

a) disease-causing
b) low-pH-tolerant
c) methanogens
d) high-pH-tolerant
e) high-pressure-tolerant


Ans: a) disease-causing

Biology & Microbiology

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All of the following are fat-soluble vitamins found in meat EXCEPT

A) D B) B C) K D) A

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The plasma membrane is a thin sheet of lipid embedded with

A. sodium and potassium ions. B. carbohydrates. C. nucleotides. D. polymers. E. proteins.

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The process of nitrogen fixation involves the transformation of ________.

A. ammonia to organic matter nitrogen B. nitrate to nitrogen gas C. nitrogen gas to ammonia D. ammonia to nitrate

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Colchicine is an alkaloid derived from plants. What is its effect on chromosome behavior?

A) By blocking DNA replication, chromosomes fail to migrate to the poles at anaphase; thus, homologous chromosomes end up in the same nucleus. B) By blocking DNA replication, chromosomes do not undergo meiosis I and instead all gametes suffer from aneuploidy. C) By interfering with spindle formation, replicated chromosomes fail to migrate to the poles at anaphase; thus, sister chromatids end up in the same nucleus. D) By interfering with spindle formation, replicated chromosomes fail to migrate to the poles at anaphase; thus, homologous chromosomes end up in the same nucleus. E) By blocking DNA replication, chromosomes do not undergo meiosis II and instead half the gametes are empty.

Biology & Microbiology