Two cells with different cell-surface markers are fused in the presence of polyethylene glycol (PEG). The cells are then placed at 0°C. What do you expect to observe about the individual cell markers?
A) The markers will evenly disperse throughout both membranes.
B) Only one marker will disperse, while the other remains stationary.
C) Both sets of markers will not mix but will migrate to opposite poles from one another.
D) The markers will essentially remain where they are, with little migration.
E) The markers will be endocytosed by the fused cell and then redistributed as fused markers.
D) The markers will essentially remain where they are, with little migration.
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Which small-scale mutation would be most likely to have a catastrophic effect on the functioning of a protein?
A) a base substitution B) a base deletion near the start of a gene C) a base deletion near the end of the coding sequence, but not in the terminator codon D) deletion of three bases near the start of the coding sequence, but not in the initiator codon E) a base insertion near the end of the coding sequence, but not in the terminator codon
Gene regulation in both prokaryotes and eukaryotes ____
a. involves significant chromatin remodeling b. requires transcription and translation to occur in separate cellular compartments c. produces differentiated cells d. involves transcriptional control e. involves alternative splicing
The primary targets for HIV are ____
a. helper T cells and macrophages b. helper T cells and cytotoxic T cells c. B cells, helper T cells, and cytotoxic T cells d. B cells and helper T cells e. B cells and macrophages
An example of passive parental care is ____
a. nutrients that cross the placenta b. nursing c. nurturing
d. the nest environment e. protection from predators