When submerged, frogs receive most of their O2 from capillaries within the skin. What structure would contain blood with the highest O2 concentration in a submerged frog, which is not able to breathe using its lungs?
A. Left atrium
B. Right atrium
C. Pulmonary vein
D. Aorta
E. Ventricle
Answer: B
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Viruses in the extracellular state possess few, if any, active enzymes.
Answer the following statement true (T) or false (F)
Which of the following is made from DNA?
a. tRNA only b. mRNA only c. rRNA only d. mRNA and tRNA only e. mRNA, tRNA, and rRNA
You find some rather strange plants in your backyard. They consist only of thin, pale yellow stems that are wrapped around other species of plants growing nearby. You experiment by unwrapping some of the strange yellow plants and planting half of them alone in pots of soil and half in pots with other plants from your yard. You water and fertilize both sets of pots, but after a few weeks you find that the yellow plants that were potted alone have died, while those potted with other plants are thriving. What term would you use to describe the strange yellow plants?
A. holoparasitic B. asexual C. monophagous D. aposematic E. hemiparasitic
Autosomal nondisjunction can result in
A) trisomy X. B) Down syndrome. C) Klinefelter syndrome. D) Turner syndrome. E) XYY males.