Which group of modern gymnosperms are the closest relatives to modern angiosperms and possess vessel elements in their xylem?
a. Gnetophytes
b. Conifers
c. Gingkophytes
d. Cycads
a. Gnetophytes
Gnetophytes are the closest relatives to modern angiosperms and possess vessel elements in their xylem.
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The chemical nature of each amino acid is determined by which of the following groups?
A) amino B) carboxyl C) hydroxil D) R E) hydrogen
To find the nucleotide sequence of human chromosomes, chromosomes had to be digested into small fragments and then ________
A) centrifuged and electrophoresed B) fingerprinted C) cloned and sequenced D) restricted
Which of the following is a component of phloem?
A. Tracheids B. Sclerenchyma cells C. Epidermal cells D. Cork cambium E. Collenchyma cells
Why are modern light microscopes better than the ones Leeuwenhoek used?
A) Modern microscopes have a fivefold better resolution. B) Modern microscopes are compound instead of simple. C) Modern microscopes have lenses with smaller numerical apertures. D) Modern lenses are made of prisms. E) Modern microscopes are compound and have fivefold better resolution.