In order to control for abiotic processes in isotopic transformations, it is essential to include a
a. positive control.
b. negative control.
c. live cell control.
d. killed cell control.
Answer: D
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Bacteria that live attached to surfaces are described as ________, whereas bacteria that are free-living, floating with a fluid environment are described as ________.
Fill in the blank(s) with the appropriate word(s).
Which hormone is released by cardiac cells in response to stretching caused by high blood pressure?
a. growth hormone b. triiodothyronine c. atrial natriuretic peptide d. erythropoietin
The contraction phase of the cardiac cycle is known as ____
a. systole b. diastole c. cardiac output d. mean arterial pressure e. pulse pressure
What is an advantage of sexual reproduction over asexual reproduction?
a)genetic variability during an ecological disaster b)genetic variability when the environment is stable c)faster reproduction d)requirement of less energy e)simpler form of reproduction