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- Scientific evidence suggests that cells evolved as symbiotic relationships between bacteria (or proto-bacteria) that became cell organelles, including mitochondria. a) True b) FalseWhich of the following statements concerning prokaryotes is TRUE? They have no nucleus and hence no DNA They have no Golgi apparatus They include bacteria, yeast, and protozoans They are all able to live on inorganic energy sources Both (b) and (c) are correctThe yeti crab is a crustacean that lives near extremely hot hydrothermal vents, where they wave their hairy forelimbs. Their limbs are covered in bacteria that convert methane (from the vent) to sugars. The crabs can often be seen waving their limbs in the water and clearing the bacteria off of their limbs with their mouthparts. Which statement below is true of this relationship? This is a commensal relationship. The crab benefits by gaining energy from the bacteria, and the bacteria neither gain fitness nor lose fitness. This is a parasitic relationship. The bacteria benefit at the expense of the crab that must waste energy keeping its limbs clean This is a mutualistic relationship. The bacteria have an ideal environment for growth and the crab has a primary source of carbohydrates in a nutrient-limited environment This is a commensal relationship. The bacteria have an ideal environment for growth and the crab has a primary source of carbohydrates in a nutrient-limited environment
- Which of the following descriptions is true only of prokaryotes? (a) They reproduce through binary fission. (b) Their genetic material is DNA. (c) They are unicellular. (d) They contain organelles within the cell. (e) none of the aboveWhich of the following statements are TRUE about organisms in the Domain Bacteria? I. Consist of bacteria and cyanobacteria II. Some are photoautotrophs III. Genetic material is a single stranded DNA IV. Organelles are not presentWhich of the following is true regarding the diversity of life ? a) Domain Archaea does not contain any disease-causing organisms. b) Bacteria can vary greatly in size and range up to 700 µm in length Microbial Eukarya may have first arisen two billion years ago, well before fungi, plants c) animal d) All of the above are true 7:33 /
- You left a carton of orange juice on your counter for 3 days. When you taste it, it is very bubbly (as though it was carbonated), and it tastes more bitter than usual. (Note: acids taste bitter). What do you think could have happened? (Note: you can’t just say that bacteria grew—you must explain how the growth of the bacteria resulted in the changes in the orange juice.) Based on what you now know about the presence of bacteria on chicken and beef, why is it a good idea to use separate chopping boards for meat and for vegetables?A group of friends went on a hiking trip to Wadi Shab, and while swimming in the Wadi they were amazed by the variety of organisms that they saw in the Wadi and the nearby area. Adnan collected a sample of water from the Wadi, soil, and some colorful rocks because he was interested to see which organisms can be found in each sample. 1. Adnan took the collected samples to a Biology Lab and he passed them to you (since you are studying BIOL2101 course) to help him observe the organisms/microorganisms that might be present in the sample. a) What would you use in order to investigate and identify the different kinds of organisms that are present in his samples? b) What would you try to do in order to "separate" the different kinds of organisms from each other (protists fungi, bacteria, etc)?(if anyone please help me with all these questions) 2. As eukaryotic cells become more specialized, the nucleus is NOT important as the site of a) DNA synthesis, b) changes in the regulation of genes, c) protein synthesis, d) the transcription of mRNA for protein synthesis, e) DNA mutation. 3. In the evolution of the eukaryotic cell, these cells have key changes that include which of the following: a) These cells reproduce by copying their DNA perfectly each generation. b) They have their DNA in the nucleoid area. c) have adapted the mesosome membrane system of the prokaryote to form a nucleus and an endoplasmic reticulum. d) each new type on new eukaryote cell has its own mesosomes e) none of these are true. 4. The evolution/development of the skeletal system found in the Deuterostomes, is made up of two molecules, Ca+2PO4-2 and collagen These molecules are produced released from by a specialized type of stem cell. Therefore, one would expect that these stem cells perform which…
- Bacteria, Archaea, and Eukarya are three _____.If your blood pressure raises, blood is allowed to flow to the capillaries which decreases blood pressure. On the other hand, if your blood pressure drops some capillaries are deprived of blood flow to raise blood pressure. This is an example of which property of life? A) All life transforms energy B) All life is organized C) All life maintains homeostasis D) All life evolves E) All life grows and develops F) All life can reproduceWhich of the following statements is true? a) cells do not need ribosomes if they have mitochondriab) all cells have a cell membrane but not all cells have a cell wallc) all prokaryotes are unicellular and all eukaryotes are multicellulard) cells can have either a cell membrane or a cell wall or both