Seed plants as a whole belong to a nontaxonomic grouping called the ____
a. angiosperms
b. gnetophytes
c. gymnosperms
d. Spermatophyta
e. tracheophytes
ANSWER: d
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Metastatic cancer cells:
A. are able to leave the tumor where they originated and travel to distant locations to set up new tumors at distant sites. B. have lost their adhesion to the extracellular matrix, freeing them from being confined to the original tumor. C. become malignant when they cross the capillary basal lamina. D. only need to cross a single layer of capillary endothelial cells to form tumors at distant sites. E. All of these choices are correct.
Because all eukaryotic cells must carry out certain functions to maintain life processes, these cells contain similar structural components, regardless of the organism from which they come.
a. true b. false
Transcription in prokaryotes is carried out by this enzyme, which unwinds and transcribes the gene.
A. RNA synthetase B. RNA polymerase holoenzyme C. RNA polymerase III D. RNA polymerase II
For the following questions, choose the letter from the list below that best matches the description (please note the answer should be a single uppercase letter):A. desertB. savannaC. taigaD. temperate grasslandE. tropical rain forestTropical; grassland with scattered trees; seasonally dry; nutrient poor soils; large grazing mammals.
Fill in the blank(s) with the appropriate word(s).