Spiders and certain other arthropods which lack jaws or mandibles are placed in a subphylum called
A. Agnathae.
B. Amandibulata.
C. blood suckers.
D. chelicerates.
E. mandibulates.
D. chelicerates.
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Which of the following has emerged as one of the leading organisms responsible for death in AIDS patients?
A. Pneumocystis jiroveci B. Acanthamoeba C. Toxoplasma gondii D. Naegleria
In Drosophila melanogaster, the gene for eye color is located on the X chromosome. The allele for red eye color
(Xw+) is dominant over the allele for white eye color (Xw). You examine a vial of 100 flies that are all offspring from a single genetic cross. You see only red-eyed females present, but you see both red-eyed and white-eyed males present. The genotypes of the parents were ____.
a. Xw+Xw+; Xw+Y b. XwXw; Xw+Y c. Xw+Xw; XwY d. Xw+Xw; Xw+Y e. XwXw; XwY
Each of the following statements accurately describes the Calvin cycle except
A) It is found in all oxygenic and most anoxygenic phototrophs. B) Carbon dioxide is fixed by reduction to form organic sugars. C) Its products enter a variety of metabolic pathways including sugar and starch biosynthesis. D) It involves ribulose-1,5-bisphosphate (RuBP). E) It is confined to the cytoplasm in plants and algae.
Select the best response to the question. ?What is a risk factor for contracting tapeworm or hookworm?
A) poor sanitation B)living or traveling in the Middle East C) living in a nursing home D) young age