The eggs released by sponges during reproduction have proteins on their surfaces that prevent sperm from different sponge species from binding to the eggs. What type of reproductive isolation would include this example?
A) gamete compatibility
B) hybrid inviability
C) mechanical reproductive isolation
D) behavioral reproductive isolation
A
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A pregnant woman was told by her doctor that while she is pregnant she might want to let someone else care for her cats so she would not contract toxoplasmosis through which mechanism?
a. Cats may have fleas that transmit toxoplasmosis b. Scratches from infected claws c. Exposure to infected cat feces d. Infection from saliva e. Infection from mice the cat may bring into the house
During calcium chloride transformation of bacteria, during which step does plasmid DNA enter the bacterial cells?
A) Brief incubation with CaCl2 on ice B) Brief electric shock following treatment with CaCl2 C) Selection on antibiotic plates D) Brief incubation at 42°C E) None of these choices
Compare and contrast the chromosome structure of viruses, bacteria, and eukaryotes
What will be an ideal response?
According to "evo-devo" thinking, an organism's body form can be substantially changed
A) only through multiple mutations that produce a large number of new proteins. B) through mutations that change sexually selected traits. C) only when changes in the environment directly alter the major protein-coding genes in the organism's genome. D) through mutations or changes in the expression of one or a few genes that regulate development.