(I have 10 questions that I need help with, I am sorry that it is a lot but I am stuck on these if anyone can please help me.) 1. The phospholipid composition of cell membranes causes the membranes to be impermeable to water molecules. However, Ca2+ and Mg+ and Cl- ions diffuse in and out of the cell because: a) Water is soluble in fatty acids found in phospholipids b) the Fatty Acid portion of the phospholipid component interacts with water c) the fatty acids are hydrophilic d) protein molecules embedded in the membrane function as H20 channels through the membrane, e) water is nonpolar.
(I have 10 questions that I need help with, I am sorry that it is a lot but I am stuck on these if anyone can please help me.)
1. The phospholipid composition of cell membranes causes the membranes to be impermeable to water molecules. However, Ca2+ and Mg+ and Cl- ions diffuse in and out of the cell because: a) Water is soluble in fatty acids found in phospholipids b) the Fatty Acid portion of the phospholipid component interacts with water c) the fatty acids are hydrophilic d) protein molecules embedded in the membrane function as H20 channels through the membrane, e) water is nonpolar.
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 of the following a) the storage and the release of Ca+2PO4-2 and collagen from vesicles from the Golgi apparatus, b) high levels of protein synthesis c) active transport of amino acids and ions into the stem cells through active transport, d) oxidation of pyruvate by the mitochondria, e) all are correct.
5. In the he octopus and squid (invertebrates), the first opening of the digestive tract organizes as anterior. Therefore, these animals are example of which evolutionary group? a) Deuterostome, b) Mesostome c) Cnideria, d) Protostome, e) Protist.
6. A multicellular eukaryote cell typically has enough available ATP to meet its needs for about 90 seconds. What would cause an active cell to exhaust its ATP supply so quickly? A) regular rest is a cellular requirement. B) Photosynthesis used up all ATP. C) ATP is transported into other cells. D) Too much glucose takes over the cell, E) the cell runs out of or uses up the available O2
7. The evolution of the three germ layers (ectoderm, mesoderm, and endoderm) in the evolution of complex animals is associated with the Annelids (earthworm) and the Mollusk (Clam), which are examples of: a) Protostomes and Deuterostomes. b) Just the Protostomes. c) Only the Deuterostomes, d) Cnideria, e) Porifera.
8. In the Cnidaria the ectoderm cells are important because they a) are the first specialized digestive cells. b) can react to a stimulus from the environment and cause the response of the cell into a directed movement. c) are needed for reproduction. d) form the first digestive organ. e) form the first real organ
9. As a unicellular eukaryote, the Amoeba is an important example of which of the following? a) It reacts to a stimulus. b) when it reacts , the stimulus produces an electrical impulse that causes a change in other proteins. c) It generates motor output (movement). d) It uses specific membrane embedded proteins as stimulus receptors. e) All of these are characteristics of the Amoeba and its behavior's.
10. The O2 to be utilized by the mitochondria of all eukaryote cells is produced by a) oxidative bacteria, b) the Calvin Cycle of the Cyanobacteria, c) Photosynthesis, dark phase, d) photosynthesis, light phase, e) all of these are correct.
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