As long as a cell is alive, it replaces patches of its plasma membrane and add new membrane proteins. How does this occur?
What will be an ideal response?
The composition of a plasma membrane begins in the ER. There, membrane proteins and lipids are made and modified, and both become part of vesicles that transport them to Golgi bodies for final modification. New plasma membrane forms when the finished proteins and lipids are repackaged as vesicles that travel to the plasma membrane and fuse with it.
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How do fossils provide evidence of evolutionary history?
A. Fossils provide an accurate account of the number of species that exist at any particular time. B. Older fossils are an excellent source of DNA from which we can construct molecular phylogenies. C. Fossils provide a record of extinct species. D. Fossils provide complete information on extinct species.
Binding of _____ to _____ in DNA can increase the rate of transcription of specific genes
a. activators; promoters b. activators; enhancers c. repressors; operators d. both activators; promoters and activators; enhancers
Development of the cerebellum in an animal correlates to the:a
animal's ability to see. b. size of that animal. c. intelligence of that animal. d. complexity of muscular activity exhibited by that animal. e. animal's ability to smell.
Cells conserve energy and resources by making active proteins only when they are needed. If a protein is not needed, which of the following methods of control would be the most energy efficient?
A. block transcription B. degrade the mRNA after it is made C. degrade the protein after it is made D. prevent translation of the mRNA