The main advantage of YAC (yeast artificial chromosome) over other vectors in cloning human genes
is that
A. it is taken up more readily by recipient cells.
B. it is larger.
C. it is less likely to trigger rejection.
D. it is made of human DNA.
E. it has unique restriction sites.
B
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The accommodation of the very long DNA strands that are part of a chromosome into the limited space of the nucleus is achieved by coiling the DNA around beads of histones into repeating subunits. These DNA-wrapped histones are called:
A. Solenoids B. Chromatin loops C. Rosettes D. Nucleosomes
Transcriptional activation of the lac operon requires both high lactose and low glucose conditions because:a
RNA polymerase requires CAP in order to bind to the lac operon promoter, even in the absence of the repressor. b. glucose normally activates the lac operon repressor. c. RNA polymerase is inactive in the presence of high glucose concentrations. d. high glucose concentrations stimulate CAP activity. e. glucose and lactose compete for binding to, and inactivation of, the lac operon repressor.
The absence of ________ in the primitive atmosphere was essential to the origin of life on Earth
A) N2 B) CO2 C) CH4 D) O2
Animals exploit the phospholipid asymmetry of their plasma membrane to distinguish between live cells and dead ones. When animal cells undergo a form of programmed cell death called apoptosis, phosphatidylserine—a phospholipid that is normally confined to the cytosolic monolayer of the plasma membrane—rapidly translocates to the extracellular, outer monolayer. The presence of phosphatidylserine on the cell surface serves as a signal that helps direct the rapid removal of the dead cell. How might a cell actively engineer this phospholipid redistribution?
A. by activating a scramblase and inactivating a flippase in the plasma membrane B. by inverting the existing plasma membrane C. by inactivating a scramblase in the plasma membrane D. by inactivating both a flippase and a scramblase in the plasma membrane E. by boosting the activity of a flippase in the plasma membrane