Q: What is the plasma membrane mainly composed of? Read this paragraph and choose the correct option from the provided answers: The plasma membrane is composed mainly of phospholipids, which consist of fatty acids and alcohol. The phospholipids in the plasma membrane are arranged in two layers, called a phospholipid bilayer . As shown in Figure below , each phospholipid molecule has a head and two tails. The head "loves" water (hydrophilic) and the tails "hate" water (hydrophobic). The water-hating tails are on the interior of the membrane, whereas the water-loving heads point outwards, toward either the cytoplasm or the fluid that surrounds the cell. Choices: - filaments - antibodies - carbon - phospholipids A:
phospholipids

Q: What organ lets us understand what we see, hear, or sense in other ways, and allows us to use language, learn, think, and remember? Read this paragraph and choose the correct option from the provided answers: The brain is the organ that lets us understand what we see, hear, or sense in other ways. It also allows us to use language, learn, think, and remember. The brain controls the organs in our body and our movements as well. The brain consists of three main parts, the cerebrum, the cerebellum, and the brain stem ( Figure below ). Choices: - heart - bone - Kidneys - brain A:
brain

Q: What happens to the volume of the gas when temperature increases but amount of gas and its pressure are constant? Read this paragraph and choose the correct option from the provided answers: There are other measurable characteristics of a gas. One of them is temperature (T). Perhaps one can vary the temperature of a gas sample and note what effect it has on the other properties of the gas. Early scientists did just this, discovering that if the amount of a gas and its pressure are kept constant, then changing the temperature changes the volume (V). As temperature increases, volume increases; as temperature decreases, volume decreases. We say that these two characteristics are directly related. A mathematical relationship between V and T should be possible except for one thought: what temperature scale should we use? We know from Chapter 2 "Measurements" that science uses several possible temperature scales. Experiments show that the volume of a gas is related to its absolute temperature in Kelvin, not its temperature in degrees Celsius. If the temperature of a gas is expressed in kelvins, then experiments show that the ratio of volume to temperature is a constant:. Choices: - nothing - volume remains constant - volume decreases - volume increases A:
volume increases