The group including ferns, whisk ferns, and horsetails includes plants with which of the following characteristics? Select all correct choices
A. plants with helically arranged leaves
B. plants with leaves arranged in whorls
C. plants lacking leaves but possessing
photosynthetic stems
D. plants having "underground" stems
E. plants lacking roots
B,C,D,E
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True or false: During the incorporation of a nucleotide during transcription, appropriate hydrogen bonding is ensured before the high-energy phosphate bond is cleaved
A. true B. false
What levels of structure can proteins assume?
a. primary and secondary b. tertiary and quaternary c. primary only d. both a and b above
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
In this exercise, how should bacterial colonies on your plate that are not S. marcescenes be recorded on the data sheet?
A) (+) B) (-)