Gram-positive bacteria
a. have a thick cell wall, which retains crystal violet dye
b. contain teichoic acids in their cell walls
d. appear purple after Gram staining
d. all of the above
Answer: d. all of the above
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______________ are defined as haploid (1n) cells that can form gametophytes. Gametophytes, in turn, produce either haploid (1n) male or female _____________ that can fuse to form diploid (2n) ____________
A. Spores; gametes; zygotes B. Gametes; spores; zygotes C. Zygotes; spores; gametes D. Spores; zygotes; gametes E. Gametes; zygotes; spores
A mutation from the most prevalent form of a gene to a mutant form is called a ________ mutation.
A. reverse B. forward C. escalating D. wild card
Which of the following is true concerning
dietary fiber?
a. polysaccharides when mixed with water form a gel that is insoluble fiber b. eating foods high in insoluble fiber lowers the risk of heart disease c. cellulose is a form of soluble fiber d. eating insoluble fiber helps prevent constipation e. all of these are true concerning dietary fiber
No one is certain what the function of the human appendix is. But, one thing we do know is that we can live without it, without noticeable consequences. Therefore, the human appendix is an example of a(n)
A) mutation. B) vestigial structure. C) analogous structure. D) homologous structure. E) adaptation.