Which structure of the human digestive tract produces bile?
a. the liver
b. the stomach
c. the gallbladder
d. the small intestine
Ans: a. the liver
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Explain why organisms undergoing rapid evolutionary change often contain relatively large numbers of mobile DNA elements, whereas once organisms settle into a stable evolutionary niche, most of these mobile elements are lost
What will be an ideal response?
A silent mutation is a mutation that only occurs in noncoding regions of DNA
A. true B. false
Cleavage-stage cells are called ____, which form a solid ball or layer called a ____
a. morulas; blastomere b. blastocoels; blastomere c. blastomeres; morula d. blastomeres; blastula e. blastulas; blastocoel
Bacteria are able to respond quickly to their surroundings, such as in the presence of an abundant food source. This isbecause:a
genes for functionally related enzymes are regulated together in operons. b. genes for functionally related enzymes are always constitutive. c. genes for functionally related enzymes are always under positive control. d. efficient protein degradation removes unneeded proteins quickly. e. all bacterial genes are constitutive.