When bacteria are inoculated into a new sterile nutrient broth, their numbers don't begin to increase immediately. Instead, there is a lag phase that may last for an hour or even several days. Why don't bacterial numbers increase immediately?
a. There are not enough nutrients for the bacteria to grow, and growth is delayed until there are some dead cells to cannibalize.
b. The bacteria have to establish a biofilm before their numbers can increase.
c. The bacteria must adjust to the nutrient content in the new medium, synthesizing necessary amino acids, growth factors, and enzymes.
d. The medium contains inhibitors that prohibit rapid growth of the bacteria, and these must be inactivated before bacterial numbers will increase.
Answer: c. The bacteria must adjust to the nutrient content in the new medium, synthesizing necessary amino acids, growth factors, and enzymes.
You might also like to view...
The spores of a fern are
(a) produced by mitosis within the sporangium. (b) diploid cells. (c) the first cells of the gametophyte generation. (d) both a and b.
Which of the following is not a part of the extracellular matrix of an animal cell?
A. collagen B. lignin C. elastin D. laminin
A cohort is
a. a group of individuals of the same species born during the same time interval. b. any member of the same species. c. a group of individuals with the same parents. d. a group of individuals of the same sex. e. any group of closely related individuals
What anatomical features help primates to live in trees?
What will be an ideal response?