Like all theories, the cell theory is never accepted by scientists as an "absolute truth." Which statement best explains why?
A) A theory evolves from collecting information, forming hypotheses, and then verifying the predictions of the hypotheses.
B) A theory is only a collection of hypotheses that have been verified by experimentation.
C) A scientific theory is not based on experimental evidence or observations.
D) Future evidence may cause a theory to be modified or even rejected
Ans: D) Future evidence may cause a theory to be modified or even rejected
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Ammonia-oxidizing bacteria play an essential role in the nitrogen cycle by ____
a. converting ammonia into nitrogen oxides b. converting ammonia into nitrites c. converting ammonia into ammonium d. converting nitrites into ammonia e. converting nitrites into nitrogen oxides
The natural philosophy of Aristotle and his colleagues was
a. mechanistic. b. vitalistic. c. a belief in absolute truth. d. a and c.
Which of the following is NOT found in every
nucleotide? a. ribose b. a phosphate group c. a single-ring base d. a double-ring base e. nitrogen
A student encounters a pondweed which appears to be a charophyte (stonewort). Which of the following features would help the student determine whether the sample comes from a charophyte or from some other type of green alga?
1. molecular structure of enzymes inside the chloroplasts 2. structure of sperm cells 3. presence of phragmoplasts 4. rings of cellulose-synthesizing complexes A) 1 and 3 B) 1 and 4 C) 2 and 3 D) 2, 3, and 4