A semipermeable membrane bag containing 10% sucrose is permeable to water but not to sucrose. The bag is immersed in water. The solution in the bag is ________ to the water, and water will move ________ the bag
a. hypotonic / into
b. hypertonic / out of
c. hypotonic / out of
d. hypertonic / into
d
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Which of the following pairs is incorrectly
matched?
a. bran-seed coat b. germ-embryo c. starch-endosperm d. all of these (a through c) are correctly matched e. all of these (a through c) are incorrectly matched
A pair-rule gene in Drosophila called runt controls some of sex and nervous system formation. In the mouse, runt controls blood cell formation, osteogenesis, and genital structures
In humans, the analog of runt, when mutated, causes children to lack collar bones, and the opening at the top of the skull fails to close. What kind of experiment could tell you whether these genes are conserved in function? A) sequencing of the runt genes from each of the three species of organisms B) in vivo experiment that inserts a copy of the mouse runt gene into a segmented fly embryo C) in vitro experiment that inserts a copy of the mouse runt gene into cells from an unsegmented Drosophila embryo D) sequencing the proteins encoded for by each of the species' runt genes E) use of immunological methods to identify the target cells of the species' runt transcription factors
Bacterial populations have been exposed to an antibiotic and have developed resistance to the antibiotic over time
Would this be an example of stabilizing selection, directional selection, or disruptive selection? Explain your reasoning. What will be an ideal response?
Why is aseptic technique important?
A) To protect others B) To protect yourself C) All of these choices are correct D) To protect your cultures