When testing the antimicrobial susceptiblity of heaemophilus influenza strains by disk diffusion, the recommended medium is
A. buffered charcoal yeast extract agar
B. chocolate agar
C. Mueller-Hinton agar with X and V factors
D. Mueller- Hinton agar with 5% sheep blood
Ans: C. Mueller-Hinton agar with X and V factors
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In the research on monkey-flower speciation, researchers found that mutations in as few as ____ genes
could result in speciation.
a. 2 b. 4 c. 8 d. 16 e. 25
The semen from a man who has had a vasectomy would include each of the following except ________
A) sperm B) secretions from the prostate gland C) secretions from the bulbourethral glands D) secretions from the seminal vesicles
The prediction, during the early 1800s, that our human population would eventually reach a point where we cannot sustain ourselves has not occurred. Why?
A) The two world wars and the AIDS crisis caused such massive mortality that the human population has stabilized. B) The prediction was wrong; human populations can grow indefinitely. C) Technological advances unforeseen at that time increased the carrying capacity to a greater extent and faster than predicted. D) Humans continue to find ways to enhance environmental quality, thus enabling more people to be supported. E) Dramatic reductions in fertility rates ended population growth before the crisis point was reached.
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.