What is the proper order of events in the expression of a eukaryotic protein?
A) DNA unpacking, mRNA transport through nucleus, mRNA splicing, protein modification
B) DNA unpacking, mRNA splicing, translation, protein folding
C) transcription, translation, addition of cap and tail to mRNA, DNA unpacking
D) transcription, mRNA splicing, protein modification, translation
Answer: B
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A number of mutations have been described in G proteins that have profound effects on their activity. For example, some mutations greatly increase the affinity of the G protein for GDP making it very difficult to be exchanged for GTP
Other mutations prevent the hydrolysis of GTP to GDP. Which of the following scenarios would still result in a proliferation signal via the kinase cascade in the absence of ligand binding to its receptor tyrosine kinase? A. A continuously active receptor and an inactive Map kinase pathway B. A Ras molecule that has no GTPase activity C. A continuously inactive MAP kinase pathway and an inactive Ras D. A continuously active Ras and an inactive MAP kinase pathway E. A continuously activated receptor in the absence of ligand
In flowering plants, petals form when ____ genes are turned on
a. only A b. only B c. only C d. both A and B e. both B and C
Insect workers propagate more of their own alleles by helping their mother reproduce rather than by reproducing themselves; thus, they share a larger fraction of their ___________ with the next generation.
A. food resources B. time C. genome D. ability to defend their nest E. home
The ________ scale is used to measure concentrations of hydrogen ions in a solution.
Fill in the blank(s) with the appropriate word(s).