When a microsporocyte divides, its daughter cells are diploid. Indicate whether the statement is true or false
False - haploid
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Water flows into the source end of a sieve tube because _____
A) sucrose has diffused into the sieve tube, making it hypotonic B) sucrose has been actively transported into the sieve tube, making it hypertonic C) water pressure outside the sieve tube forces in water D) the companion cell of a sieve tube actively pumps in water E) sucrose has been transported out of the sieve tube by active transport
The age of volcanic rocks is determined by
a. fossil identification. b. chemical analysis. c. radiometric dating. d. analysis of surrounding minerals. e. hardness testing.
Gel electrophoresis separates DNA fragments according to their:
A. percentage of labeled nucleotides B. base sequence C. number of attached primers D. size
The parasitic Rhagoletis flies show such a preference for either hawthorn or apple trees that they are no longer interbreeding populations. What type of speciation does this scenario illustrate?
A) Specialization B) The founder effect C) Allopatric D) Polyploidy E) Sympatric