A scientific theory is:
A. a suggested explanation that accounts for observations.
B. a way to organize how we think about a problem.
C. a concept that is supported by experimental evidence that explains the facts in an area of study.
D. a way to understand a complex system by reducing it to its working parts.
C. a concept that is supported by experimental evidence that explains the facts in an area of study.
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George Beadle and Edward Tatum created a collection of mutants to study the following pathway
A mutant shows no growth on minimal media; however it shows growth if citrulline is provided. These results indicate the mutation would most likely be in the gene for: A. Enzyme I. B. Enzyme II. C. Enzyme III D. either Enzyme I or Enzyme II. E. either Enzyme II or Enzyme III.
Which early scientist proposed that cells arise only from preexisting cells by a process of division?
a. Anton van Leeuwenhoek b. Robert Brown c. Matthias Schleiden d. Theodor Schwann e. Rudolf Virchow
The failure of chromosomes to separate during meiosis is called
A) crossing over B) genetic displacement C) non-disjunction D) disjunction
Each daughter DNA consists of one new strand and one old strand. This process is called _______ replication.
Fill in the blank(s) with the appropriate word(s).