Enzymes that readily break starch apart cannot hydrolyze the glycosidic linkages found in cellulose. Why is this logical?
A) The geometry of the bonds is different, and the shapes of enzyme active sites are highly specific.
B) Starch is held together by hydrogen bonding, not covalent bonding.
C) Cellulose molecules are highly branched, and enzymes are too bulky to fit.
D) Starch is held together by peptide bonds, not glycosidic linkages.
Answer: A
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In regions of a chromosome that encode highly structured RNA molecules, what sequence characteristics would you expect to find?
A. an abundance of pyrimidines, which play an important role in three-dimensional folding of RNA B. an abundance of uracil, which plays an important role in three-dimensional folding of RNA. C. multiple short segments capable of base pairing with adjacent or distant regions of the sequence. D. heavy methylation of these gene sequences, preventing their expression E. very little in the way of sequences that can form double-stranded helices
The smartest of all invertebrates is the
a. octopus. b. squid. c. slug. d. ant. e. crab.
Which of the following events does not occur in prophase II?
a. formation of the spindle b. condensation of chromatin into chromosomes c. formation of chiasmata d. removal of the nuclear membrane e. sister chromatids become visible when viewed with the light micros
The mechanism that allows chromatin exchange during meiosis in eukaryotes is ________
Fill in the blank with correct word.