In a negative feedback system, which one of the following statements is TRUE?
A) A sensor detects a stimulus, which in turn amplifies the original disturbance.
B) Deviations from a desired condition are automatically detected and counteracted.
C) Homeostasis cannot be re-established until the effector is turned off.
D) The effector activates the sensor.
E) A sensor is not needed because the body anticipates the coming change.
B
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The codons UCU, UCC, UCA, and UCG all code for the same amino acid, serine. In which position of the codon are mutations most likely to be found when comparing the same gene of two closely related species?
A. position 1 B. position 2 C. position 3 D. none of the positions; any change will be lethal.
Each of the following is a model for membrane structure except
A) Overton lipid coat. B) Langmuir monolayer. C) Gorter and Grendel bilayer. D) Singer and Nicholson fluid mosaic. E) Watson and Crick double helix.
How many chromosomes are in a red blood cell taken from a normal person? ____________________ Fill in the blank(s) with the appropriate word(s)
How are two different species most likely to evolve from one ancestral species?
A) sympatrically, by a point mutation affecting morphology or behavior B) sympatrically, due to extensive inbreeding C) allopatrically, due to extensive inbreeding D) allopatrically, after the ancestral species has split into two populations