Nextstep 2 Bio Flashcards
Which phase of mitosis is likely to be first interrupted if a cell has no microtubules?
They are attached to chromosomes in metaphase and pull them apart in anaphase. Therefore, the first phase to be affected by lack of microtubules will be metaphase.
Arachidonic acid and tyrosine are precursors to?
arachidonic acid is important as a precursor for the biosynthesis of the eicosanoid signaling molecules: prostaglandins, thromboxanes, and leukotrienes. Neither molecule contributes to the synthesis of catecholamines, which are a class of molecules derived from tyrosine
bacterial genes have no?
For the most part, bacteria lack introns, whereas large eukaryotic genes usually contain several introns. A large, eukaryotic gene without introns suggests a bacterial origin.
The disruption of which membrane component is most likely to result in cellular traffic complications similar to those seen in gap junction disorders?
The cell membrane is composed of several different components, each responsible for different functions. Membrane transport is most likely to be affected if the disruption occurs in components that span the entire membrane. Transmembrane proteins (many of which are glycoproteins) are the only component listed that pass all the way through the cell membrane and facilitate membrane transport. The cell membrane is composed of several different components, each responsible for different functions. Membrane transport is most likely to be affected if the disruption occurs in components that span the entire membrane. Transmembrane proteins (many of which are glycoproteins) are the only component listed that pass all the way through the cell membrane and facilitate membrane transport.
Phospholipids and glycolipids are located on the surface of cell membranes and typically do not extend though the entire bilayer. Glycolipids act to provide energy and also serve as markers for cellular recognition. Phospholipids are a structural component of the membrane and are not involved in traffic/transport.
Which components of cells are physically connected by a gap junction?
The cytoskeleton of one to the plasma membrane of the other
What type of control does siRNA exert on G6P expression?
Due to its structure, siRNA is only able to bind to other RNA strands, not to DNA or protein. Therefore, it must interfere with gene expression after transcription has already occurred, but before translation. Specifically, it prevents the translation of mRNA corresponding to the target protein.
