Do you agree or disagree with the following statement? Explain your answer
Like many other extracellular proteins, newly synthesized collagen molecules undergo post-translational processing inside the cell to convert them into their mature form; they are then secreted and self-assemble into fibrils in the extracellular space.
Disagree. The cell secretes newly synthesized collagen molecules in an immature form as procollagen, and the peptides at the ends of the procollagen molecules then have to be cleaved off in the extracellular space before fibril assembly can occur. This process ensures that collagen fibrils will not assemble prematurely inside the cell.
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Which of the following should have had gene sequences most similar to the charophyte (stonewort) that was the common ancestor of the land plants?
A) early angiosperms B) early bryophytes C) early gymnosperms D) early lycophytes E) early pterophytes
Which organism, which is oxidase positive, does not grow on TCBS agar, has the ability to decarboxylate lysine and ornithine but cannot utilize arginine, and would have the following co-lonial characteristics on sheep blood agar and MacConkey agar?
a. <-hemolytic and is a nonlactose fermen-ter b. <-hemolytic and is a lactose fermenter c. <-hemolytic and is a nonlactose fermen-ter d. <-hemolytic and is a nonlactose fermenter
The Galápagos Islands are inhabited by 13 species of Darwin's finches that evolved from a single species. This is an example of
A) clinal variation. B) adaptive radiation. C) directional selection. D) genetic drift.
Plant species A has a diploid number of 28. Plant species B has a diploid number of 14. A new, sexually reproducing species C arises as an allopolyploid from hybridization of A and B. The diploid number of C would probably be
A) 14. B) 21. C) 28. D) 42. E) 63.