Which of the following amino acids are most frequently phosphorylated by protein kinases in the cytoplasm during signal transduction?
A) tyrosines
B) glycine and histidine
C) serine and threonine
D) glycine and glutamic acid
C
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Which of the following features of DNA organization do eukaryotes and bacteria have in common (select all correct choices)?
A. DNA is associated with basic proteins. B. DNA is found within a 30 nm filament. C. DNA breakage in one loop will not affect DNA in other loops. D. A change of supercoiling in a cleaved loop would not affect other loops. E. Under electron microscope, DNA will have a beads-on-a-string appearance.
Which of the following is NOT a function of the extracellular matrix?
A. provides strength B. provides structural support C. provides organization of cells throughout the organism D. provides an important source of energy for the organism E. cell signaling
Most of the water absorbed by the plant enters through the
A. root apical meristem. B. root cap. C. root hairs. D. stomata. E. lenticels.
Describe the roles of the following enzymes during DNA replication: ligase, single-stranded binding
protein (SSB), DNA polymerase III, primase, DNA helicase.
What will be an ideal response?