Which of the following describes the function of the lacO region of the lac operon?
A. It encodes for the Lac repressor protein.
B. It contains the promoter for the operon.
C. Mutation of this region leads to constitutive expression of the operon.
D. It encodes for the galactoside permease protein.
C
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Mendel postulated that individuals have genetic elements that exist in pairs, which determine a single phenotype. What do we now know these pairs of elements to be?
A) a sperm and an egg B) pairs of centromeres C) two alleles of a gene on homologous chromosomes D) two haploid sets of chromosomes E) pairs of sister chromatids
Recall that leaves form in distinct arrangements (whorled, opposite or alternate) on the stems of vascular plants. How might chemical factors secreted by neighboring structures cause new leaves to form in these particular patterns?
Select all correct choices. A. Leaf primordia secrete chemical inhibitors that prevent the formation of leaves nearby. B. Leaf primordia secrete chemical activators that promote the formation of leaves nearby. C. Mature leaves secrete chemical inhibitors that prevent the formation of leaves nearby. D. Mature leaves secrete chemical activators that promote the formation of leaves nearby.
Eukarya are believed to have diverged from the bacterial line of descent. The Eukarya are, therefore, more closely related to the Bacteria than to the Archaea.
Answer the following statement true (T) or false (F)
A gene that produces multiple effects is called a(n) ____
a. co-dominant gene b. X-linked gene c. epistatic gene d. pleiotropic gene e. incompletely dominant gene