Carbon 14 radioisotopes decay into stable ____
nitrogen 15 isotopes
a. carbon 13 isotopes
b. nitrogen atoms
c. carbon atoms
d. nitrogen 15 isotopes
e. sodium atoms
ANSWER: b
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Aristotle developed one of the first taxonomical classification schemes
Indicate whether the statement is true or false
Cyanobacteria ________
a. are ancient species that released oxygen during photosynthesis b. can withstand exposure to boiling water c. cannot perform nitrogen fixation d. are thought to be very similar to the first cells in existence
One centimeter = ________ millimeters
A) 0.01 B) 0.10 C) 10 D) 100
Which term refers to the regulatory events that establish a specific pattern of gene activity and developmental fate for a given cell?
A) determination B) attenuation C) gradient regulated D) lysogen E) differentiation