Prokaryotic cells are likely to be found
a. in and on our bodies, in our food and water.
b. in glacial ice that never thaws.
c. in acidic springs.
d. in hydrothermal vents.
e. in all of these
E
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Match the scientist(s) on the left with the statement on the right
A) proposed the protein-lipid-protein "sandwich" model of the cell membrane B) proposed the "unit membrane" model based on electron microscopy images of the "railroad track" pattern of membranes C) proposed the fluid mosaic model of the cell membrane D) described the chemical nature of the cell membrane E) created lipid monolayers from solubilized cell membrane lipids F) determined the 3D structure of a membrane protein demonstrating transmembrane segments G) created lipid bilayers from solubilized cell membrane lipids H) demonstrated that a biological membrane is a lipid bilayer 1) Davson and Danielli 2) Gorter and Grendel 3) J. David Robertson 4) Irving Langmuir 5) Unwin and Henderson 6) Charles Overton 7) Singer and Nicolson
Which of the following allows groups of skeletal muscle cells to perform coordinated contractions? (2 points)
a. Their sarcolemma is fused to the tendons, allowing them to function without continual nerve stimulation. b. Their cells are branched and joined end to end, allowing them to function without continual nerve stimulation. c. They contain a complex network of striations, allowing more efficient cell-to-cell communication d. They are connected into multinucleate tissues, allowing more efficient cell-to-cell communication.
An example of an anion is K+
__________________ Indicate whether the statement is true or false.
The posterior pituitary gland secretes all of the following EXCEPT
A. prolactin. B. ADH. C. oxytocin. D. None of the choices are correct.