Which of the following types of reproductive barriers separates two flowering plant species that could interbreed but for the fact that one has a deep flower tube and is pollinated by bumblebees whereas the other has a short, narrow flower tube and is
pollinated by honeybees?
A) habitat isolation
B) behavioral isolation
C) mechanical isolation
D) gametic isolation
Answer: C
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Which genes are expressed in Drosophila after pattern formation along the A/P axis has been successfully established?
A. totipotent genes B. bicoid genes C. segment polarity genes D. gap genes E. homeotic genes
Histamine
a. causes blood vessels to contract. b. causes capillaries to lose their permeability. c. causes an outward flow of fluids from the capillaries. d. reduces tissue swelling. e. enhances the function of cytokines.
Tranquilizers such as Xanax and Valium alleviate anxiety by enhancing effects of which neurotransmitter?
A. Serotonin B. GABA C. Dopamine D. Norepinephrine E. Epinephrine
Infection by which of the following results in the formation of Ghon complexes?
A) Bordetella pertussis B) Corynebacterium diphtheriae C) Mycobacterium tuberculosis D) Streptococcus pyogenes E) Blastomyces dermatidis