The four nucleotides that make up DNA contain a sugar component called ________
Fill in the blank(s) with correct word
deoxyribose
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Suppose that frog embryos were genetically manipulated so that the epidermal cells expressed both E-cadherin and N-cadherin on their cell surface
The neuronal tissue and epidermal tissues were collected from the embryos and treated as illustrated in Figure 10.15b. Which of the following would you predict would happen now that N-cadherin is also present on the surface of the epidermal cells? A. The modified epidermal cells would adhere to each other and to neuronal cells. B. The genetically modified epidermal cells would adhere to neuronal cells and would no longer adhere to epidermal cells. C. The epidermal cells would adhere to each other, and not to the neuronal cells, because they would still be epidermal cells regardless of the presence of an additional cell adhesion protein on their surface.
Chemical cues that help guide a developing pollen tube toward an ovule are released by the
a. antipodal cells. b. synergids. c. egg. d. central cell. e. sperm.
As adults, insulin signaling through its receptor kinase enables virtually every cell in our body to transport glucose across the plasma membrane into the cytosol. Use the following five terms to complete the sentences below
Terms (A-E) may be used once, more than once or not at all. A. receptor binding B. receptor activation C. signal transduction and amplification D. response E. termination Autophosphorlyation of transmembrane proteins caused by insulin association with those proteins is an example of __________________. _________________ occurs when the proteins that are phosphorylated after insulin associates with the cell-surface protein become dephosphorylated. The noncovalent association of insulin with specific proteins on the surface of a cell is an example of ___________. Activated proteins in the nucleus causing transcription (and eventually translation in the cytosol) of proteins needed for cell division is an example of _________. _______________ occurs when the insulin receptors phosphorylate each other causing other proteins in the cytoplasm to bind to them, including a protein called insulin-receptor substrate 1 (or IRS-1). _______________ occurs when the phosphorylated cytosolic protein IRS-1 binds to other cytosolic proteins to activate them, which in turn bind to others to activate them. One consequence of IRS-1 stimulation is the exchange of GDP for GTP in Ras, which is an example of _______________. ___________________ occurs when the GTP bound to Ras is hydrolyzed to GDP. One consequence of IRS-1 stimulation is the uptake of glucose by the cell, which is an example of ________________. What will be an ideal response?
During the passage of a nerve impulse,
a. sodium ions pass through gated channels. b. positive feedback causes more sodium ions to enter the cell. c. the interior of the cell becomes positive relative to the outside. d. changing voltage increases the number of open gates. e. all of these occur.