What is the primary characteristic of all animals in the phylum Arthropoda?
a. jointed appendages
b. incomplete digestive systems
c. asexual reproduction
d. pseudocoelomic body cavities
a. jointed appendages
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Why is the movement of blood in veins sometimes described as "milking a vein"?
What will be an ideal response?
If a DNA sequence is ATC, what is the sequence in the molecule produced during transcription?
a. UAG b. TAG c. ATC d. AUG e. AUC
If scientists studying cancer could understand how to promote cell division in cells that do not ordinarily divide, this might help people who had injuries involving
A) muscle or nerve cells. B) intestinal cells. C) bone cells. D) skin cells.
Answer the following questions true (T) or false (F)
1. Cholera toxin is composed of five A subunits and one B subunit. 2. The small intestine is the site of the majority of nutrient digestion and absorption. 3. Complete recovery from hepatitis A infection occurs 99% of the time.