The large central vacuole of plants:
A) produces proteins.
B) allows the plant to produce its own food.
C) replaces the nucleus.
D) may make up as much as 90 percent of the internal volume of the cell.
Answer: D
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________ proteins stabilize partially folded parts of proteins in their correct form.
A) Chaperone B) Signal sequences C) Proteasomes D) Ubiquitin
In eukaryotic cells, the cell cycle is divided into two main phases in which the cell spends most of its time and metabolic energy. These two phases are
A. interphase and mitosis. B. mitosis and meiosis. C. interphase and cytokinesis. D. interphase and binary fission. E. mitosis and cytokinesis.
The primary function of DNA ligase is to
a. cut the two strands of the DNA molecule prior to replication. b. attach free nucleotides to the growing chain. c. remove bases that might be inserted incorrectly. d. seal new short stretches of nucleotides into one continuous strand. e. fragment old DNA that is no longer of use to the cell.
Describe the DNA helix structure proposed by Watson and Crick
What is the diameter of the helix and the distance between bases? What types of bonds are involved in stabilizing the DNA backbone, and what types of bonds are found between complementary base pairs? Why would a sequence containing high concentrations of G and C require more energy to break the bonds?