Answer the following question given this paragraph: Centrioles are rod-like structures made of short microtubules. Though they are found in most eukaryotic cells, centrioles are absent in some plants and most fungi. Q: What is the general shape of centrioles? Choices: - spherical - arc - oval - rod A:
rod
Answer the following question given this paragraph: Prokaryotes are single-celled organisms that lack a nucleus. They are placed in two domains: the Bacteria Domain and the Archaea Domain. They were the first organisms to evolve. It's not certain how they are related to each other or to eukaryotes. Q: What are single-celled organisms that lack a nucleus called? Choices: - protists - fungi - eukaryotes - prokaryotes A:
prokaryotes
Q: Answer the following question given this paragraph: A peptide bond is the amide bond that occurs between the amino nitrogen of one amino acid and the carboxyl carbon of another amino acid. The resulting molecule is called a dipeptide. Notice that the particular side chains of each amino acid are irrelevant since the R groups are not involved in the peptide bond. Q: What is the amide bond that occurs between the amino nitrogen of one amino acid and the carboxyl carbon of another amino acid? Choices: - a covalent bond - a magnetite bond - a amino bond - a peptide bond A:
A: a peptide bond
Question: Answer the following question given this paragraph: Osmotic Pressure The net pressure that drives reabsorptionthe movement of fluid from the interstitial fluid back into the capillariesis called osmotic pressure (sometimes referred to as oncotic pressure). Whereas hydrostatic pressure forces fluid out of the capillary, osmotic pressure draws fluid back in. Osmotic pressure is determined by osmotic concentration gradients, that is, the difference in the solute-to-water concentrations in the blood and tissue fluid. A region higher in solute concentration (and lower in water concentration) draws water across a semipermeable membrane from a region higher in water concentration (and lower in solute concentration). As we discuss osmotic pressure in blood and tissue fluid, it is important to recognize that the formed elements of blood do not contribute to osmotic concentration gradients. Rather, it is the plasma proteins that play the key role. Solutes also move across the capillary wall according to their concentration gradient, but overall, the concentrations should be similar and not have a significant impact on osmosis. Because of their large size and chemical structure, plasma proteins are not truly solutes, that is, they do not dissolve but are dispersed or suspended in their fluid medium, forming a colloid rather than a solution. Q: Which type of pressure forces fluid out of the capillary? Choices: - air - gas - combustion - hydrostatic A:
Answer: hydrostatic
*Question*
Answer the following question given this paragraph: Christopher Auyeung, using bat image by User:Rugby471/Wikimedia Commons. Bats use echolocation to identify the location of objects . CC BY-NC 3.0 (bat image available under public domain). Q: What do bats use to determine the location of objects? Choices: - infrared light - UV light - syncopation - echolocation A:
**Answer**
echolocation
*Question*
Answer the following question given this paragraph: The Breasts Whereas the breasts are located far from the other female reproductive organs, they are considered accessory organs of the female reproductive system. The function of the breasts is to supply milk to an infant in a process called lactation. The external features of the breast include a nipple surrounded by a pigmented areola (Figure 27.17), whose coloration may deepen during pregnancy. The areola is typically circular and can vary in size from 25 to 100 mm in diameter. The areolar region is characterized by small, raised areolar glands that secrete lubricating fluid during lactation to protect the nipple from chafing. When a baby nurses, or draws milk from the breast, the entire areolar region is taken into the mouth. Breast milk is produced by the mammary glands, which are modified sweat glands. The milk itself exits the breast through the nipple via 15 to 20 lactiferous ducts that open on the surface of the nipple. These lactiferous ducts each extend to a lactiferous sinus that connects to a glandular lobe within the breast itself that contains groups of milk-secreting cells in clusters called alveoli (see Figure 27.17). The clusters can change in size depending on the amount of milk in the alveolar lumen. Once milk is made in the alveoli, stimulated myoepithelial cells that surround the alveoli contract to push the milk to the lactiferous sinuses. From here, the baby can draw milk through the lactiferous ducts by suckling. The lobes themselves are surrounded by fat tissue, which determines the size of the breast; breast size differs between individuals and does not affect the amount of milk produced. Supporting the breasts are multiple bands of connective tissue called suspensory ligaments that connect the breast tissue to the dermis of the overlying skin. Q: Breasts are considered accessory organs of what body system? Choices: - digestive system - nervous system - lymphatic system - female reproductive system A:
**Answer**
female reproductive system