Imagine that you are studying a new species. As you examine the circulatory system, you note that the diameter of the vessels grows smaller and smaller as you move farther from the heart, but the blood is always contained within vessels. If you want to place this new species into a group whose membership is solely based on whether the animals included share this described type of circulatory system, which animals would be included in this group? Check all that apply.
A. fish
B. housefly
C. frogs
D. all mollusks
Answer:
C. frogs
A. fish
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Which one of the following is not an example of combinatorial control of eukaryotic gene expression?
A. The HAT activity of the yeast Gcn5 protein alters chromatin structure. B. Fos-Jun heterodimers bind DNA with higher affinity than Fos-Fos or Jun-Jun homodimers. C. Two regulatory proteins that form homo- and heterodimers bind to three different regulatory sites. D. Expression of the even-skipped gene product of the fruit fly is differentially controlled by the uneven distribution of four transcription factors.
The products of fat digestion in the small intestine are reassembled into triglycerides by the intestinal epithelium, before combining them with proteins to form ___________.
A. chylomicrons B. chyme C. vesicles D. bile E. cholesterol
The Cap Acrosome on a sperm contains what?
What will be an ideal response?
Which of the following is most likely to stop sexually transmitted diseases (STDs)?
A) tubal ligation B) latex condom C) diaphragm D) IUD