Explain the strengths and limitations of using 16S rRNA for phylogenetic analyses
What will be an ideal response?
Answer: Due to function constraints, the 16S rRNA gene sequence has changed relatively little over time and is therefore an excellent individual nucleotide sequence useful in phylogenetic studies. It is not especially good at distinguishing among different species within a genus, because there is often not enough variation between the sequences. There are large and freely available databases dedicated to cataloging 16S rDNA sequences, and it remains the "gold standard" today for phylogenetic analyses.
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In seed plants, meiosis produces ____ megaspores, however ____ leaving a single functional megaspore to produce a
____ gametophyte.
a. four; three disintegrate; male b. four; three disintegrate; female
c. eight; seven disintegrate; female d. two; one disintegrates; male e. two; one disintegrates; female
Which of the following is NOT TRUE of
cystic fibrosis? a. It produces sticky mucus. b. It leads to increased bacterial lung infections. c. The amino acid affected is phenylalanine. d. It causes insufficient water to leave the cells. e. All of these are true.
Common skin warts are the result of infection with
A) poxviruses. B) herpesviruses. C) papillomaviruses. D) rubeola virus. E) parvoviruses.
Dense regular connective tissue consists of tightly packed _____
Fill in the blank(s) with the appropriate word(s).