Which of the following is not part of the step that occurs between glycolysis and the Krebs cycle?
A. Reduction of NAD+
B. Oxidation of pyruvic acid
C. Coenzyme A attaches to an acetyl group
D. Pyruvic acid accepts electrons from NADH
Answer: D
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Gene expression in developing organisms is regulated on several different levels. In many developing animals, regulation of gene expression is influenced by the action of Hox genes. Which of the following regulatory elements is produced by many Hox genes?
A) transcriptional factors B) cell-surface molecules for cell-cell interactions C) signals from maternal cytoplasm, such as bicoid D) mRNA processing factors
Which tests detect anti-HIV antibodies?
A. ELISA and Western Blot B. PCR and gene probe C. Western Blot and PCRD.
Microbial activity generates methylmercury, which is much less toxic than the mercuric ion
Indicate whether the statement is true or false.
All cells possess all of the following components EXCEPT
A) a nuclear membrane. B) ribosomes. C) a plasma cell membrane. D) cytoplasm. E) genetic material (DNA or RNA).