Heterospory refers to having ____
a. both male and female gametes
b. two types of spores in two different types of sporangia
c. both male and female parts on the same plant
d. separate male and female plants
e. both sporophyte and gametophyte generations
ANSWER: b
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The fiddlehead is a ________ that unfolds into a ________.
A. diploid sporophyte; fern frond B. haploid gametophyte; fern frond C. diploid gametophyte; fern frond D. diploid gametophyte; moss plant E. haploid sporophyte; fern frond
The tissue type that provides communication among cells is called
A. epithelial. B. connective. C. nervous. D. muscle. E. All of the answer choices are correct.
Which of the following statements is true of proteins?
a. Proteins lose some or all of their normal activity if their three-dimensional structure is disrupted. b. Proteins are composed of ribose, phosphate, and a nitrogen-containing base. c. The activity of proteins is independent of temperature and pH. d. Denaturation is usually reversible. e. All proteins are enzymes.
Explain what might occur when purine or pyrimidine bases in nucleotides undergo tautomeric shifts
What will be an ideal response?