Which of the following terms best characterizes catabolite repression associated with the lac operon in E. coli?
A) constitutive
B) inducible system
C) positive control
D) negative control
E) repressible system
Ans: C) positive control
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Wood is composed of ____
a. primary xylem b. secondary xylem c. primary phloem d. secondary phloem e. both xylem and phloem
In the human genetic disorder alkaptonuria, urine turns black because of the presence of homogentisic acid in individuals with the trait. This is due to
A) the presence of large amounts of homogentisic acid in the diet. B) failure of individuals with alkaptonuria to manufacture enzymes involved in the synthesis of homogentisic acid. C) failure of wild-type individuals to manufacture enzymes involved in the synthesis of homogentisic acid. D) failure of the kidneys to remove homogentisic acid from the urine. E) failure of individuals with alkaptonuria to manufacture enzymes involved in the breakdown of homogentisic acid.
In what portion of a eukaryotic cell is the majority of DNA isolated?
a. nucleus b. mitochondria c. vesicles d. cytoplasm e. lysosome
Describe the DNA base sequence arrangement at the end of the Tetrahymena chromosome and the resolution of DNA replication at the end of a linear DNA strand
What will be an ideal response?