Investigators are studying a protein that must be phosphorylated to be activated. Which method could be used to separate the phosphorylated form of the protein from the form that lacks an activating phosphate group?
A.) equilibrium sedimentation
B.) velocity sedimentation
C.) ion exchange chromatography
D.) differential centrifugation
E.) gel filtration chromatography
Ans: C.) ion exchange chromatography
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Which nucleotide sequence is complementary to the DNA sequence 5'-GACGTT-3'?
a. 5'-TCATGG-3' b. 3'-TCATGG-5' c. 3'-CTGCAA-5' d. 3'-AGTACC-5' e. 5'-TTGCAG-3'
The dominant phenotype can be produced by which of the following?
a) Rr only b) Both RR and Rr c) RR only d) Both Rr and rr e) rr only
Given the distribution of the 30 or so animal phyla across the Earth's various ecosystems, what would be the most likely habitat for the origin of animals?
A. Deserts B. Temperate grassland C. Oceans D. Freshwater habitats E. Rain forests
Which is true regarding release of the T4 bacteriophage?
a. T4 enzymes compromise the cell membrane and peptidoglycan, causing lysis of the host cell. b. Cro allows the expression of release proteins, leading to host-cell lysis. c. Newly assembled T4 phages are released via a secretion apparatus. d. T4 phages exit via budding, assembling an envelope from the cell membrane.