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
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All of the following are fat-soluble vitamins found in meat EXCEPT
A) D B) B C) K D) A
The plasma membrane is a thin sheet of lipid embedded with
A. sodium and potassium ions. B. carbohydrates. C. nucleotides. D. polymers. E. proteins.
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
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.