The most abundant polymer in the world is:
a. cellulose.
b. glucose.
c. hemicellulose.
d. lignin.
e. pectin.
a
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Arctic and alpine tundras have all of the following in
common EXCEPT a. low moisture. b. permafrost. c. minimal plant life. d. cold temperatures. e. nutrient-poor soils.
The set of phenotypes expressed by a single genotype across a range of environmental conditions is referred as the norm of ________
Fill in the blank(s) with correct word
Which phase of cell division is depicted in the accompanying figure?
a. prophase of mitosis b. metaphase of mitosis c. prophase I of meiosis d. prophase II of meiosis e. metaphase I of meiosis
Which of the following provides he weakest evidence that mitochondria were once free living prokaryotes
A. Mitochondrial ribosomes resemble those of prokaryotes B. Mitochondria have DNA that is circular and does not have associated protein C. Enzyme pathways on mitochondrial membranes resemble those found on modern prokaryotes membranes D. Mitochondria reproduce by a process similar to binary fission E. Mitochondria and prokaryotes both are found in a variety of sizes