According to the fossil record, the oldest vascular plants are placed in which phylum?
a. Rhyniophyta
b. Bryophyta
c. Anthocerophyta
d. Pteridophyta
e. Lycopodiphyta
a
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Around 1914, ________ determined that DNA was an important component in ________ by using a staining technique that is still in use today.
Fill in the blank(s) with the appropriate word(s).
The difference between cystic fibrosis and migraine is that the
A) former is caused by various environmental factors. B) former can be traced to a single gene. C) former is caused by the absence of a chromosome. D) latter is a Mendelian trait.
Puffballs and bracket fungi are most closely related to:
a. molds. b. truffles. c. the common edible mushroom. d. yeast. e. the black bread mold.
Which of the following statements about disulfide bond formation is false?
(a) Disulfide bonds do not form under reducing environments. (b) Disulfide bonding occurs by the oxidation of pairs of cysteine side chains on the protein. (c) Disulfide bonding stabilizes the structure of proteins. (d) Disulfide bonds form spontaneously within the ER because the lumen of the ER is oxidizing.