Q: What is the term for a watertight seal between two adjacent animal cells? Read this paragraph and choose the correct option from the provided answers: A tight junction is a watertight seal between two adjacent animal cells (Figure 3.17b). Proteins hold the cells tightly against each other. This tight adhesion prevents materials from leaking between the cells. Tight junctions are typically found in the epithelial tissue that lines internal organs and cavities, and composes most of the skin. For example, the tight junctions of the epithelial cells lining the urinary bladder prevent urine from leaking into the extracellular space. Also found only in animal cells are desmosomes, which act like spot welds between adjacent epithelial cells (Figure 3.17c). They keep cells together in a sheet-like formation in organs and tissues that stretch, like the skin, heart, and muscles. Gap junctions in animal cells are like plasmodesmata in plant cells in that they are channels between adjacent cells that allow for the transport of ions, nutrients, and other substances that enable cells to communicate (Figure 3.17d). Structurally, however, gap junctions and plasmodesmata differ. Choices: - cell membrane - cell wall - placental barrier - tight junction A:
tight junction

(Question)
Q: What is the name of the cloud where most long-period comets come from? Read this paragraph and choose the correct option from the provided answers: Some comets have periods of thousands or even millions of years. Most long-period comets come from a very distant region of the solar system. This region is called the Oort cloud. The Oort cloud is about 50,000100,000 times the distance from the Sun to Earth. Choices: - stellar cloud - bulge cloud - volt cloud - oort cloud A:
(Answer)
oort cloud

Ques: Q: What types of flat maps show users changes in land elevation? Read this paragraph and choose the correct option from the provided answers: Topographic maps are flat maps that show the three-dimensional surface features of an area. Topographic maps help users see the how the land changes in elevation. Choices: - surveyor maps - atlases - elliptical maps - topographic maps A:
Ans: topographic maps

(Q).
Q: If hot water becomes trapped, pressure may build up. when the water breaks free, it creates what? Read this paragraph and choose the correct option from the provided answers: If hot water becomes trapped, pressure may build up. When the water breaks free, it creates a geyser. Choices: - groundwater - steam - glacier - geyser A:
(A).
geyser

Ques:Q: How do they classify tornadoes? Read this paragraph and choose the correct option from the provided answers: The winds of a tornado can reach very high speeds. The faster the winds blow, the greater the damage they cause. Wind speed and damage are used to classify tornadoes ( Table below ). Choices: - wind density - amount of destruction - wind temperature - wind speed A:

Ans:wind speed

Question: Q: What term means the abnormal or excessive extension of a joint - particularly a hinged joint - beyond its normal range of motion, thus resulting in injury? Read this paragraph and choose the correct option from the provided answers: These include anterior-posterior movements of the arm at the shoulder, the forearm at the elbow, the hand at the wrist, and the fingers at the metacarpophalangeal and interphalangeal joints. For the thumb, extension moves the thumb away from the palm of the hand, within the same plane as the palm, while flexion brings the thumb back against the index finger or into the palm. These motions take place at the first carpometacarpal joint. In the lower limb, bringing the thigh forward and upward is flexion at the hip joint, while any posterior-going motion of the thigh is extension. Note that extension of the thigh beyond the anatomical (standing) position is greatly limited by the ligaments that support the hip joint. Knee flexion is the bending of the knee to bring the foot toward the posterior thigh, and extension is the straightening of the knee. Flexion and extension movements are seen at the hinge, condyloid, saddle, and ball-and-socket joints of the limbs (see Figure 9.12a-d). Hyperextension is the abnormal or excessive extension of a joint beyond its normal range of motion, thus resulting in injury. Similarly, hyperflexion is excessive flexion at a joint. Hyperextension injuries are common at hinge joints such as the knee or elbow. In cases of "whiplash" in which the head is suddenly moved backward and then forward, a patient may experience both hyperextension and hyperflexion of the cervical region. Choices: - sprain - tear - hypercorrection - hyperextension A:
Answer:
hyperextension