In humans, fiber does all of the following EXCEPT
A. provide energy.
B. prevent constipation.
C. help control weight gain.
D. prevent hemorrhoids.
A. provide energy.
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The same basic array of bones is modified to give rise to the wing of a bat and the fin of a porpoise. Such anatomical structures are called:
A. uniform. B. inherited. C. homologous. D. analogous. E. evolutionary modifications.
Describe the makeup of the phospholipid bilayer. Include molecular orientation and proteins as well
What will be an ideal response?
Cells are often ground up with abrasive to get to their internal enzymes/molecules, followed by removal of the abrasives. Here are three situations and three outcomes. What is the correct interpretation of the results?
In situation #1, radioactive amino acids are added to cell material, and radioactive proteins are produced. In situation #2, radioactive amino acids, cell material, and the enzyme DNAse (degrades DNA) are added together. Radioactive proteins are still produced. In situation #3, the ground-up cell material is allowed to sit for 24 hours before radioactive amino acids and DNAse are added to it. No radioactive protein is produced. What is the most likely interpretation? A. RNA polymerase has no activity after 24 hours, so no mRNA is transcribed and translated into radioactive proteinsin the last scenario. B. The radioactivity in the amino acids is altering/degrading the tRNA molecules, leading to no protein production in the last scenario. C. Natural RNAses present in the ground-up material will degrade any existing mRNAs in that 24-hour interval. Added DNAses breakdown DNA so that new RNAs are not synthesized.This will lead to a loss of capability to translate protein in the last scenario. D. The results are not interpretable from the information given.
Which of the following is NOT found in bile?
a. salts b. cholesterol c. pigments d. digestive enzymes e. lipids