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

Biology & Microbiology

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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

Biology & Microbiology

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?

Biology & Microbiology

In what portion of a eukaryotic cell is the majority of DNA isolated?

a. nucleus b. mitochondria c. vesicles d. cytoplasm e. lysosome

Biology & Microbiology

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.

Biology & Microbiology