Algae that are important sources of thickening agents like agar are known as
A) Rhodophyta.
B) Phaeophyta.
C) Chrysophyta.
D) Rhizobium.
E) Chlorophyta.
A
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Which of the following is an example of a special sense?
A. touch B. temperature C. pain D. vision E. position
A hypothesis
1.is a tentative explanation for an observation that can be tested by further investigation. 2.is never tested by an experiment. 3.is never used by field biologists. 4.is the same as a theory.
In Meselson and Stahl's experiment, what kind of DNA molecules would be found after four replication cycles?
A) Only heavy DNA (15N-15N) B) Only intermediate DNA (15N-14N) C) Only light DNA (14N-14N) D) Both heavy (15N-15N) and light DNA (14N-14N) E) Both heavy (15N-15N) and intermediate DNA (15N-14N)
Which statement about forensic DNA profiling is false?
A) The results are always given in terms of the probability that two individuals' DNA could give the exact same genetic profile. B) The technique takes advantage of the fact that portions of the human genome vary greatly throughout the population. C) Because the tests are often run on very small biological samples, such as drops of blood, PCR reactions are used to amplify the DNA before the profiling begins. D) After a profile has been done, a complete DNA sequence is often used to verify the results. E) The strength of DNA fingerprinting is that it determines the alleles that an individual carries at not 1 but 13 different STR locations