The lower end of the the uterus narrows and leads to the ________ which opens into the vagina.
A) cervix.
B) labia.
C) rectum.
D) ovary.
A) cervix.
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Chloroplasts are composed of membranous sacs called ________ that carry chlorophyll. Surrounding these sacs is a ground substance called ________.
A. grana; stroma B. cristae; stroma C. thylakoid; matrix D. cristae; matrix E. thylakoids; stroma
Which of the following describes the Lac operon in E. coli when both lactose and glucose are present in the culture medium?
A. The Lac repressor, but not CAP, is bound to the Lac operon's regulatory DNA, and the Lac operon is not expressed. B. Neither CAP nor the Lac repressor is bound to the Lac operon's regulatory DNA, and the Lac operon is not expressed. C. CAP and the Lac repressor are both bound to the Lac operon's regulatory DNA, and the Lac operon is not expressed. D. CAP binds to the Lac repressor, preventing it from binding to the Lac operon's regulatory DNA, and the Lac operon is expressed. E. CAP, but not the Lac repressor, is bound to the Lac operon's regulatory DNA, and the Lac operon is expressed.
Which data would not affect maximum likelihood estimates of phylogenies when comparing different tree hypotheses?
A. The tree topology B. The lengths of the branches C. The branching order of the tree D. Nucleotide substitution rate E. All of these are important for finding the most likely tree.
The type of immunoglobulin illustrated in Figure 16.1 is
A. IgE. B. IgG. C. IgA. D. IgM. E. IgD.