In the human body, which of the following structures contains cells that are part of the endocrine system? Select all correct choices
A. the pancreas
B. the stomach
C. the intestines
D. the brain
E. the ovaries
A,B,C,D,E
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Transposable elements are
A) segments of DNA that move from one site to another. B) transcribed genes. C) segments of RNA that are involved in transposing DNA into proteins. D) proteins that aid in the secretion of enzymes out of the cell.
The most diverse group of placental mammals are the ____
a. bats b. carnivores c. rodents d. moles and shrews e. whales and dolphins
Which of the following is a function of the sterols that are found in animal cell membranes?
a. They maintain membrane fluidity. b. They facilitate ion transport. c. They store cellular energy. d. They increase the rate of diffusion.
Imagine that you have isolated a mysterious liquid from a sample of food. You add the liquid to a beaker of water and shake vigorously. After a few minutes, the water and the other liquid separate into two layers
To which class of biological molecules does the unknown liquid most likely belong? A) Enzymes B) Nucleic acids C) Carbohydrates D) Proteins E) Lipids