The accompanying figure is a micrograph of what kind of tissue?
a. cardiac muscle
b. skeletal muscle
c. smooth muscle
d. cartilage
e. dense connective
ANSWER: b
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The one-way flow of air along parabronchi makes what type of gas exchange mechanism possible, at least theoretically?
A) the same as that occurring in fish gills B) the same as that occurring in insect tracheae C) the same as that occurring in mammalian lungs D) the same as that occurring in echinoderm skin gills
The G1 checkpoint is used to determine which of the following?
a. if DNA replication has finished b. if the chromosomes have lined up at the metaphase plate c. if sister chromatids are attached to spindle microtubules properly d. if adequate reserves and cell size have been reached
Which of the following organisms is most likely to become fossilized?
a. a lake trout b. a mountain goat c. a tulip d. a mushroom e. all of these organisms are equally likely to fossilize
You treat some cells with a proteolytic enzyme that is too large to penetrate the cell membrane (Set 1). Another group of cells is made permeable to the enzyme before treatment with the enzyme (Set 2). A third set of cells was NOT treated with the enzyme at all (controls). Proteins are then extracted from the three different sets of cells and applied to an SDS-PAGE gel. Protein W migrates to the same distance on a gel of proteins from Set 1 and Set 2; Protein W migrates a shorter distance on gels of proteins extracted from the control group than on gels of proteins extracted from Set 1 and Set 2 treated cells. Protein X migrates to the same distance on a gel of proteins from control cells and the gels of the proteins from Set 1 and Set 2. Protein Y migrates a longer distance when
extracted from Set 1 cells than does protein Y in the controls; Protein Y moves an even larger distance in the gel of the extracts from Set 2. Protein Z migrates the same distance on gels of proteins from the controls and the proteins extracted from Set 1, but it migrates a longer distance in extracts from Set 2 cells. Which protein is exposed only on the exterior of the cell? a) protein X b) protein Z c) protein Y d) protein W