What will happen if a bacterial cell is pretreated with a lysozyme solution, then placed in distilled water?
A) The cell will plasmolyze.
B) The cell will undergo osmotic lysis.
C) Water will leave the cell.
D) Lysozyme will diffuse into the cell.
E) No change will result; the solution is isotonic.
B
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What is the evolutionary advantage of bacteria producing restriction endonucleases?
A. These enzymes are a defensive measure of bacteria to defend themselves against invading DNA of bacteriophages. B. Bacteria use these enzymes to attack other bacteria and destroy their DNA. C. They make these enzymes for humans to use in manipulating DNA. D. Bacteria use these enzymes to repair their own mistakes made during DNA replication.
The female gametophyte is the
a. flower. b. ovule. c. embryo sac. d. carpel. e. ovary
What would be the most effective method of reducing the incidence of blood flukes in a human population?
A) reduce the mosquito population B) reduce the population of the intermediate snail host C) avoid contact with rodent droppings D) carefully wash all raw fruits and vegetables
What kind of entity is a lichen?
A) an association between a fungus and a brown alga B) an association between a multicellular protist related to the brown algae and a bacterium C) an association between a fungus and cyanobacteria or green algae D) an association between a bryophyte and a fungus