Explain why the xylem of angiosperms is probably more efficient at transporting water and minerals than the xylem of gymnosperms
What will be an ideal response?
Angiosperm xylem is compose of both tracheids and vessel members. Gymnosperm xylem is composed of only tracheids. Vessel members are more efficient at water transport because they have larger holes in their end walls and fit together in an end-to-end fashion. Tracheids are slender cells that overlap at their ends and have much smaller holes.
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Which of the following E. coli polymerases functions in the replication of the chromosome?
A. DNA Pol I B. DNA Pol II C. DNA Pol III D. DNA Pol IV E. both DNA Pol II and Pol IV
Histones are the ____
a. major class of proteins in chromatin b. initiators of DNA replication c. cause of SARS d. genes that encode for deoxyribose e. molecules that prevent strong hydrogen bonding
The fossils of more than 250,000 species have been discovered, suggesting that ________
a. very few fossil species remain to be discovered b. about half of all the organisms that lived on Earth have been described c. the range of biodiversity was quite small during past epochs d. many remain undiscovered and that the fossil record will never be complete
The carbon dioxide acceptor in the Calvin-
Benson cycle of photosynthesis is
a. phosphoglycerate (PGA). b. ribulose bisphosphate (RuBP). c. phosphoglyceraldehyde (PGAL). d. glucose. e. phosphoenolpyruvate.