Answer the following question given this paragraph: Chapter 23 1 Figure 23.5 All eukaryotic cells have mitochondria, but not all eukaryotic cells have chloroplasts. 3 Figure 23.18 C 4 D 6 C 8 D 10 B 12 C 14 A 16 A 18 Eukaryotic cells arose through endosymbiotic events that gave rise to the energy-producing organelles within the eukaryotic cells such as mitochondria and chloroplasts. The nuclear genome of eukaryotes is related most closely to the Archaea, so it may have been an early archaean that engulfed a bacterial cell that evolved into a mitochondrion. Mitochondria appear to have originated from an alpha-proteobacterium, whereas chloroplasts originated as a cyanobacterium. There is also evidence of secondary endosymbiotic events. Other cell components may also have resulted from endosymbiotic events. 20 As an intestinal parasite, Giardia cysts would be exposed to low pH in the stomach acids of its host. To survive this environment and reach the intestine, the cysts would have to be resistant to acidic conditions. 22 By definition, an obligate saprobe lacks the ability to perform photosynthesis, so it cannot directly obtain nutrition by searching for light. Instead, a chemotactic mechanism that senses the odors released during decay might be a more effective sensing organ for a saprobe. 24 The trypanosomes that cause this disease are capable of expressing a glycoprotein coat with a different molecular structure with each generation. Because the immune system must respond to specific antigens to raise a meaningful defense, the changing nature of trypanosome antigens prevents the immune system from ever clearing this infection. Massive trypanosome infection eventually leads to host organ failure and death. Q: All eukaryotic cells have mitochondria, but not all eukaryotic cells have what? Choices: - ribosomes - golgi bodies - cytoplasm - chloroplasts A:
chloroplasts
(Question)
Answer the following question given this paragraph: The most common mode of asexual reproduction is through the formation of asexual spores, which are produced by one parent only (through mitosis) and are genetically identical to that parent (Figure 24.8). Spores allow fungi to expand their distribution and colonize new environments. They may be released from the parent thallus either outside or within a special reproductive sac called a sporangium. Q: The most common mode of asexual reproduction is through the formation of asexual these? Choices: - fibers - atoms - cells - spores A:
(Answer)
spores
Ques: Answer the following question given this paragraph: A gas is a form of matter that has neither a definite shape nor a definite volume. A gas takes up the shape and volume of its container. This is because the particles of a gas are very far apart from one another compared to the particles that make up solids and liquids. Gases are easily compressed because of the large spaces in between gas particles. Gas particles are often invisible, but they can be detected in various ways, such as the light emitted when an electric current is passed through a sample of a gas ( Figure below ). Q: What form of matter has neither a definite shape nor a definite volume? Choices: - plasma - solid - liquid - gas A:
Ans: gas
(Q).
Answer the following question given this paragraph: Most bacteria may be placed into one of three groups based on their response to gaseous oxygen. What are these three groups?. Q: Most bacteria may be placed into one of three groups based on their response to gaseous? Choices: - potassium - nitrogen - carbon - oxygen A:
(A).
oxygen
Ques:Answer the following question given this paragraph: Your body needs proteins to create muscles, regulate chemical reactions, transport oxygen, and perform other important tasks in your body. But how are these proteins built? They are made up of units called amino acids. Just like there are only a few types of blocks in a set, there are a limited number of amino acids. But there are many different ways in which they can be combined. Q: What is needed to create muscles, regulate chemical reactions, and transport oxygen? Choices: - cytoplasm - lipids - enzymes - proteins A:

Ans:proteins
Question: Answer the following question given this paragraph: Chemical cells are found in batteries. They produce voltage by means of chemical reactions. Chemical cells have two electrodes, which are strips of different materials, such as zinc and carbon. The electrodes are suspended in an electrolyte. This is a substance that contains free ions, which can carry electric current. The electrolyte may be either a paste, in which case the cell is called a dry cell, or a liquid, in which case the cell is called a wet cell. Flashlight batteries contain dry cells. Car batteries contain wet cells. Q: Batteries produce voltage through what type of reaction? Choices: - liquid - non-chemical - thermal - chemical A:
Answer:
chemical