Double membrane that surrounds the nucleus in eukaryotic cells and is connected to the endoplasmic reticulum; has pores that allow substances to pass between the nucleus and the cytoplasm.
What will be an ideal response?
nuclear envelope
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How many protons are in the nucleus of a
phosphorus atom?
a. 5 b. 7 c. 10 d. 15 e. 30
The Galapagos __________ are a small archipelago off the coast of South America where Charles Darwin visited as a naturalist aboard the HMS Beagle.
Fill in the blank(s) with the appropriate word(s).
Helper T cells activate both B cells and cytotoxic T cells.
Answer the following statement true (T) or false (F)
In plants, most differentiated cells retain
A) only a tiny fraction of their original set of genes. B) a complete set of their genes but lose the ability to express most of those genes. C) a complete set of their genes and retain the ability to express those genes under certain circumstances. D) the ability to dedifferentiate but then cannot return to their original differentiated state.