When the researchers tested 51 volunteers for age-dependency of this newly identified organism what were the results
a. more of these organisms were found moist to oily skin of the elderly
b. less of these organisms were found moist to oily skin of the elderly
c. more of these organisms were found dry skin of the elderly
d. less of these organisms were found dry skin of the elderly
Answer: c. more of these organisms were found dry skin of the elderly
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Bilaterians are distinguished by:
A. mirror symmetry that results in a distinct head and tail and one plane of symmetry. B. radial symmetry that results in multiple planes of symmetry. C. no symmetry, which allows for a distinct head and tail. D. circular symmetry, which allows for multiple planes of symmetry and a head and tail.
Which substance can easily cross the human blood brain barrier in a healthy individual?
a. viral proteins b. bacterial DNA c. human white blood cells d. cortisol e. albumin
Why does E. coli shut down the trp operon if tryptophan is available in the environment?
a. Synthesizing an amino acid takes energy so it is a waste of energy to make something that is already available. b. Environmental tryptophan is of higher quality than what the E. coli can make itself. c. The trp operon encodes genes that export tryptophan from the cell; if there is already tryptophan in the environment, further export isn't necessary. d. It doesn't shut down the trp operon but only lowers the level of trp operon activity. e. E. coli actually turns the trp operon on when tryptophan is present; tryptophan is an energy source for the cell, and there is no reason to make enzymes to degrade something that is lacking in the environment.
If a cell containing 20 chromosomes divides by meiosis, how many daughter cells will be produced?
a) 10 b) 20 c) 8 d) 2 e) 4