Which of these is a property of isotopes that make it useful in cell biology?
A. they never breakdown
B. they behave the same chemically
C. they behave differently chemically
D. the molecules they are part of break down more easily
E. the molecules they are part of are more stable
Ans: B. they behave the same chemically
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Why is the traditionally defined taxon Reptilia paraphyletic?
What will be an ideal response?
Restriction enzymes
A. cut only single-stranded DNA molecules. B. can cut randomly along a double-stranded DNA molecule. C. cut DNA molecules at specific sites. D. cut only single-stranded RNA molecules. E. function in DNA replication.
The "Age of Fishes" is an informal name for the:a
Ordovician period. b. Silurian period. c. Devonian period. d. Permian period. e. Carboniferous period.
Metanephridia are found in __________ and function in __________.
a. insects ... excretion b. annelids ... excretion and osmoregulation c. bats ... osmoregulation d. earthworms ... excretion e. birds ... osmoregulation and excretion