When E. coli cells produce the amino acid tryptophan, a cluster of five genes is transcribed together. This cluster of genes is referred to as the
A. trp transcriptional operator.
B. trp regulator.
C. trp suppressor.
D. trp operon.
E. trp promoter.
D. trp operon.
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Friedrich Miescher is credited with _____
a. proposing DNA as the hereditary material b. finding that proteins are the physical basis of inheritance c. defining the laws of inheritance d. being the first person to describe and extract DNA e. determining that proteins are composed of unlimited combinations of twenty amino acids
The function of the stop- transfer and start-transfer sequence is to make a________ protein
Fill in the blank(s) with the appropriate word(s).
In places where the public sanitation is poor, people run the risk of getting ____
a. West Nile virus b. cholera c. SARS d. anthrax e. mononucleosis
All of the following are true about prokaryotic cells EXCEPT:
a. Prokaryotic cells are smaller than eukaryotic cells. b. They do not contain DNA. c. They have no membrane-bound organelles. d. They have ribosomes and a cell membrane. e. They are found in two domains: Bacteria and Archaea.