Where do antigen-presenting cells interact with T cells?
a. the thymus gland
b. the pituitary gland
c. the lymph nodes
d. the adrenal glands
e. the bone marrow
ANSWER: c
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What is the primary distinguishing feature that separates the gymnosperms from the angiosperms?
What will be an ideal response?
Use the table to answer the corresponding question(s)
Species Pairs Percent Divergence in a Selected DNA Sequence Human?chimpanzee 1.7 Human?gorilla 1.8 Human?orangutan 3.3 Human?gibbon 4.3 Human?rhesus monkey (Old World monkey) 7.0 Human?spider monkey (New World monkey) 10.8 Human?tarsier 24.6Based on the data in Table 18-1, which of the following primates is the most distantly related to humans? a. chimpanzee b. gorilla c. rhesus monkey d. gibbon e. orangutan
In zygomycetes such as Rhizopus, the zygospore is haploid
____________________ Indicate whether the statement is true or false.
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