Answer the following question given this paragraph: Cell transport refers to the movement of substances across the cell membrane. Probably the most important feature of a cell's phospholipid membranes is that they are selectively permeable. A membrane that is selectively permeable , or semipermeable, has control over what molecules or ions can enter or leave the cell, as shown in Figure below . This feature allows a cell to control the transport of materials, as dictated by the cell's function. The permeability of a membrane is dependent on the organization and characteristics of the membrane lipids and proteins. In this way, cell membranes help maintain a state of homeostasis within cells (and tissues, organs, and organ systems) so that an organism can stay alive and healthy. Q: Cell transport refers to the movement of substances across what structure? Choices: - cell wall - chloroplasm - phloem - cell membrane A:
cell membrane
Answer the following question given this paragraph: A day or two after an ovary releases an egg, the egg may unite with a sperm. Sperm are deposited in the vagina during sexual intercourse. They propel themselves through the uterus and enter a fallopian tube. This is where fertilization usually takes place. Q: From the uterus, where do sperm travel next? Choices: - urinary tract - ovaries - vagina - fallopian tubes A:
fallopian tubes
Q: Answer the following question given this paragraph: Mutations that lead to cancer usually occur in genes that control the cell cycle. These include tumor-suppressor genes and proto-oncogenes. Q: Mutations that lead to cancer usually occur in genes that control the cell cycle. these include tumor-suppressor genes and what? Choices: - extinction - oncogenes - apparition - oncogenes - Darkness Oncogenes - proto-oncogenes A:
A: proto-oncogenes
Question: Answer the following question given this paragraph: What weighs about three pounds and contains up to 100 billion cells? The answer is the human brain. The brain is the control center of the nervous system. It's like the pilot of a plane. It tells other parts of the nervous system what to do. Q: Which organ is the control center of the nervous system? Choices: - the heart - the spine - the lungs - the brain A:
Answer: the brain
*Question*
Answer the following question given this paragraph: When water moves into a cell by osmosis, osmotic pressure may build up inside the cell. If a cell has a cell wall, the wall helps maintain the cell's water balance. Osmotic pressure is the main cause of support in many plants. When a plant cell is in a hypotonic environment, the osmotic entry of water raises the turgor pressure exerted against the cell wall until the pressure prevents more water from coming into the cell. At this point the plant cell is turgid ( Figure below ). The effects of osmotic pressures on plant cells are shown in Figure above . Q: What type of pressure may build up inside the cell when water moves into a cell by osmosis? Choices: - pleasurable pressure - impervious pressure - transverse pressure - osmotic pressure A:
**Answer**
osmotic pressure
Answer the following question given this paragraph: Ribosomes Ribosomes are the cellular structures responsible for protein synthesis. When viewed through an electron microscope, free ribosomes appear as either clusters or single tiny dots floating freely in the cytoplasm. Ribosomes may be attached to either the cytoplasmic side of the plasma membrane or the cytoplasmic side of the endoplasmic reticulum (Figure 3.7). Electron microscopy has shown that ribosomes consist of large and small subunits. Ribosomes are enzyme complexes that are responsible for protein synthesis. Because protein synthesis is essential for all cells, ribosomes are found in practically every cell, although they are smaller in prokaryotic cells. They are particularly abundant in immature red blood cells for the synthesis of hemoglobin, which functions in the transport of oxygen throughout the body. Q: What term is used to describe the cellular structures responsible for protein synthesis? Choices: - chromosomes - chloroplasts - nuclei - ribosomes A:
ribosomes