Answer the following question given this paragraph: Hemoglobin Hemoglobin is a large molecule made up of proteins and iron. It consists of four folded chains of a protein called globin, designated alpha 1 and 2, and beta 1 and 2 (Figure 18.7a). Each of these globin molecules is bound to a red pigment molecule called heme, which contains an ion of iron (Fe2+) (Figure 18.7b). Q: Hemoglobin is a large molecule made up of proteins and iron. it consists of four folded chains of a protein called this? Choices: - peptide - histone - insulin - globin A:
globin
Answer the following question given this paragraph: Amino acids join together to form a molecule called a dipeptide. The OH from the carboxyl group of one amino acid combines with a hydrogen atom from the amino group of the other amino acid to produce water (blue). Q: What is the molecule, dipeptide formed together by? Choices: - polymer acids - rna acids - acetic acids - amino acids A:
amino acids
Q: Answer the following question given this paragraph: Q: Membranes will become increasingly what as temperatures rise? Choices: - acidic - metallic - toxic - fluid A:
A: fluid
Question: Answer the following question given this paragraph: The structure of a chloroplast is shown in Figure below . The chloroplast is surrounded by two membranes. Inside the chloroplast are stacks of flattened sacs of membrane, called thylakoids . The thylakoids contain chlorophyll. Surrounding the thylakoids is a space called the stroma . The stroma is filled with watery ("aqueous") fluid. Q: Thylakoids in a chloroplast contain what plant pigment? Choices: - melanin - dye - ultramarine - chlorophyll A:
Answer: chlorophyll
*Question*
Answer the following question given this paragraph: Lipid Absorption About 95 percent of lipids are absorbed in the small intestine. Bile salts not only speed up lipid digestion, they are also essential to the absorption of the end products of lipid digestion. Short-chain fatty acids are relatively water soluble and can enter the absorptive cells (enterocytes) directly. Despite being hydrophobic, the small size of short-chain fatty acids enables them to be absorbed by enterocytes via simple diffusion, and then take the same path as monosaccharides and amino acids into the blood capillary of a villus. The large and hydrophobic long-chain fatty acids and monoacylglycerides are not so easily suspended in the watery intestinal chyme. However, bile salts and lecithin resolve this issue by enclosing them in a micelle, which is a tiny sphere with polar (hydrophilic) ends facing the watery environment and hydrophobic tails turned to the interior, creating a receptive environment for the long-chain fatty acids. The core also includes cholesterol and fat-soluble vitamins. Without micelles, lipids would sit on the surface of chyme and never come in contact with the absorptive surfaces of the epithelial cells. Micelles can easily squeeze between microvilli and get very near the luminal cell surface. At this point, lipid substances exit the micelle and are absorbed via simple diffusion. The free fatty acids and monoacylglycerides that enter the epithelial cells are reincorporated into triglycerides. The triglycerides are mixed with phospholipids and cholesterol, and surrounded with a protein coat. This new complex, called a chylomicron, is a water-soluble lipoprotein. After being processed by the Golgi apparatus, chylomicrons are released from the cell (Figure 23.33). Too big to pass through the basement membranes of blood capillaries, chylomicrons instead enter the large pores of lacteals. The lacteals come together to form the lymphatic vessels. The chylomicrons are transported in the lymphatic vessels and empty through the thoracic duct into the subclavian vein of the... Q: About 95 percent of lipids are absorbed in what organ of the digestive system? Choices: - kidneys - stomach - large intestine - small intestine A:
**Answer**
small intestine
*Question*
Answer the following question given this paragraph: Hinge Joints In hinge joints, the slightly rounded end of one bone fits into the slightly hollow end of the other bone. In this way, one bone moves while the other remains stationary, like the hinge of a door. The elbow is an example of a hinge joint. The knee is sometimes classified as a modified hinge joint (Figure 38.28). Q: The elbow is an example of a what type of joint? Choices: - pipe joint - toe joint - frame joint - hinge joint A:
**Answer**
hinge joint