How does the presence of allolactose affect the lactose operon?
a. Allolactose binds to the repressor, altering its shape so it cannot bind to operators
b. Allolactose binds to the operators so the repressor cannot bind there.
c. Allolactose binds to the promoter so RNA polymerase may not bind there.
d. Allolactose has a homeodomain that binds to specific base sequences in the first gene, blocking transcription.
a
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Koopman’s research on mouse meiosis showed that
a. there is a meiosis promoting gene. b. a meiosis inhibiting gene leads to retinoic acid production. c. retinoic acid prevents meiosis. d. the Cyp26b1 gene is expressed in testes but not ovaries. e. there is no effect if male mice do not have a Cyp25b1 gene.
What is the smallest unit of an element that retains the properties of that element?
a. atom b. compound c. ion d. molecule e. mixture
If two populations diverge geographically and/or genetically from each other, and the process
continues long enough, they may become two different:a. species. b. hybrids. c. polyploids. d. allopolyploids. e. euploids
Bacteriophage release is a gradual process in which small numbers are released at a time.
Answer the following statement true (T) or false (F)