A microbiologist obtained two pure isolated biological samples: one of a virus, and one of a viroid. The labels came off during a move from one lab to the next, however
The scientist felt she could distinguish between the two samples by analyzing for the presence of a single type of molecule. What type of molecule would she be looking for to differentiate between the two?
A. DNA
B.
Protein
C.
Lipids
D. RNA
B
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During gastrulation, the cellular process by which ectoderm in the animal pole spreads toward the vegetal pole is called
A. epiboly. B. invagination. C. involution. D. convergent extension. E. apical constriction.
The ____ includes all of the water on Earth
a. abiotic environment b. biotic environment c. hydrosphere d. lithosphere e. atmosphere
C14 is a radioactive isotope, and due to its predictable
__________ rate it is used to date organic fossils. Fill in the blank(s) with the appropriate word(s).
A freshwater pond ecosystem includes only the living organisms within the pond
Indicate whether the statement is true or false