Advanced Biology Question Preview (ID: 41935)
Chapter 11 Test Review.
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Proteins that bind to DNA and turn on operons by making it easier for RNA polymerase to bind to a promoter are called
a) activators.
b) operators
c) repressors
d) regulators
Both prokaryotic and eukaryotic cells use ________ to turn certain genes on or off.
a) nucleosome packing
b) proteins
c) RNA transcriptase
d) intron segments
RNA splicing involves the
a) addition of a nucleotide cap to the molecule.
b) removal of introns from the molecule.
c) addition of a nucleotide tail to the molecule.
d) removal of exons from the molecule.
Which of the following permits a single gene to code for more than one polypeptide?
a) alternative RNA splicing
b) retention of different introns in the final version of the different mRNA strands
c) genetic differentiation
d) addition of different types of caps and tails to the final version of the mRNA strands
In multicellular organisms, the coordination of cellular activities relies on
a) the availability of certain key nutrients as cells divide.
b) operons.
c) cell-to-cell signaling and signal transduction pathways.
d) cell receptors that detect transcription factors.
To initiate a signal transduction pathway, a signal binds to a receptor protein usually located in the
a) nucleus.
b) plasma membrane
c) cytoplasm
d) ER
Transcription factors attach to
a) DNA
b) signal molecules
c) plasma membrane receptors.
d) mRNA
Why can some plants be cloned from a single cell?
a) Plant cells are capable of self-renewal by utilizing cellular components from adjacent cells.
b) Plant cells can produce genes to replace those lost during development.
c) Plant cells do not differentiate even when mature, so any cell can grow into an entire plant.
d) Plant cells can dedifferentiate and give rise to all of the specialized cells required to produce an entire plant.
The cloning of Dolly the sheep
a) demonstrated, for the first time, that eggs are haploid and body cells are diploid.
b) demonstrated that differentiated cells contain only a fraction of their full genetic potential.
c) demonstrated that the nuclei from differentiated mammalian cells can retain their full genetic potential.
d) revealed that cloned mammals most resemble the egg donor.
The use of cloning to produce special embryonic stem cells is called
a) therapeutic cloning.
b) transplantational cloning.
c) reproductive cloning.
d) regenerative cloning.
Adult stem cells have limited therapeutic potential
a) because their developmental potential is limited to certain tissues.
b) because they lack a complete set of genes.
c) due to their excessive numbers in tissues.
d) because they are fully differentiated.
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