When a bacterium is introduced to a new environment that is an appropriate medium for that species to grow, fission allows a rapid expansion of the population (2-4-8-16-32-64... etc). But there is usually a slight lag before the bacteria actually begin building up such a logarithmic growth curve. What is the best explanation?

A. It takes time for sub-cellular units to evolve the ability to digest new media
B. A bacterium is not actively producing all the enzymes it can code for, and it takes time to induce and amplify the production of the currently needed enzymes
C. Binary fission becomes more and more efficient
D. A new media dissolves away repressor proteins
E. Structural genes act more slowly than metabolic genes


Answer: B. A bacterium is not actively producing all the enzymes it can code for, and it takes time to induce and amplify the production of the currently needed enzymes

Biology & Microbiology

You might also like to view...

Which of the following is true?

a) The aqueous layer of the tear film is the thickest layer. b) The lipid layer of the tear film is produced by the conjunctival goblet cells. c) The mucin layer is secreted by the glands of Wolfring. d) There are 4 layers of the tear film.

Biology & Microbiology

At which of the following stages of meiosis would homologous chromosomes be paired?

A) prophase of meiosis I B) both prophase of meiosis I and prophase of meiosis II C) metaphase of meiosis I D) metaphase of meiosis II E) both prophase of meiosis I and metaphase of meiosis I

Biology & Microbiology

Antidiuretic hormone is produced in the

a. pons. b. medulla oblongata. c. hypothalamus. d. amygdala. e. pituitary gland

Biology & Microbiology

The most abundant class of antibodies in serum is ________.

A. IgG B. IgE C. IgD D. IgA E. IgM

Biology & Microbiology