How many chromatids would you expect to find in a dividing diploid cell whose haploid number is 5 at that stage of the mitotic cycle when the nuclear membrane disappears?
What will be an ideal response?
20
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Which of the following is NOT a part of the MAP kinase pathway? (Select all correct choices.)
A. A receptor kinase is activated by binding to a growth factor and phosphorylates receptor cytoplasmic domains. B. The activated receptor kinase dimer activates the RAS protein to bind to a GTP. C. The activated RAS protein activates protein kinases in the signal-transduction pathway. D. A series of protein kinases amplify the signal to the nucleus where genes responsible for cell division are switched on. E. A pyrophosphatase enzyme terminates the cellular response.
A sudden reduction in population size generally results in
a. extinction. b. mutation. c. speciation. d. genetic drift. e. natural selection.
In which one of the following ways do prokaryotic cells differ from eukaryotic cells?
A) Prokaryotic cells have a plasma membrane composed entirely of protein. B) Prokaryotic cells lack a membrane-bound nucleus and other membranous organelles. C) Prokaryotic cells lack DNA, RNA, and ribosomes. D) Prokaryotic cells have cytoplasm that is bounded by a cell membrane. E) Prokaryotic cells have cytoplasm but lack a cell membrane.
The condensation reaction that forms nucleic acid polymers occurs between a _____ group on one nucleotide and a _____ group on a second nucleotide.
A) nitrogenous base, nitrogenous base B) phosphate, hydroxyl C) carbon, carbon D) nitrogenous base, sugar