Answer the following question given this paragraph: 4.2 Epithelial Tissue In epithelial tissue, cells are closely packed with little or no extracellular matrix except for the basal lamina that separates the epithelium from underlying tissue. The main functions of epithelia are protection from the environment, coverage, secretion and excretion, absorption, and filtration. Cells are bound together by tight junctions that form an impermeable barrier. They can also be connected by gap junctions, which allow free exchange of soluble molecules between cells, and anchoring junctions, which attach cell to cell or cell to matrix. The different types of epithelial tissues are characterized by their cellular shapes and arrangements: squamous, cuboidal, or columnar epithelia. Single cell layers form simple epithelia, whereas stacked cells form stratified epithelia. Very few capillaries penetrate these tissues. Glands are secretory tissues and organs that are derived from epithelial tissues. Exocrine glands release their products through ducts. Endocrine glands secrete hormones directly into the interstitial fluid and blood stream. Glands are classified both according to the type of secretion and by their structure. Merocrine glands secrete products as they are synthesized. Apocrine glands release secretions by pinching off the apical portion of the cell, whereas holocrine gland cells store their secretions until they rupture and release their contents. In this case, the cell becomes part of the secretion. Q: The main functions of epithelia are protection from the environment, coverage, secretion and excretion, absorption, and this? Choices: - absorption - accumulation - diffusion - filtration A:
filtration
(Question)
Answer the following question given this paragraph: Nuclear changes occur with a simultaneous release of energy. Where does this energy come from? If we could precisely measure the masses of the reactants and the products of a nuclear reaction, we would notice that the amount of mass drops slightly in the conversion from reactants to products. Consider the following nuclear reaction, in which the molar mass of each species is indicated to four decimal places:. Q: Nuclear changes occur with a simultaneous release of what, and a slight drop in mass? Choices: - oil - mineral - hydrogen - energy A:
(Answer)
energy
Ques: Answer the following question given this paragraph: This equation shows that momentum is directly related to both mass and velocity. An object has greater momentum if it has greater mass, greater velocity, or both. For example, a bowling ball has greater momentum than a softball when both are moving at the same velocity because the bowling ball has greater mass. However, a softball moving at a very high velocity say, 100 miles an hour would have greater momentum than a slow-rolling bowling ball. If an object isn't moving at all, it has no momentum. That's because its velocity is zero, and zero times anything is zero. Q: Momentum is directly related to both mass and? Choices: - mass - intensity - speed - velocity A:
Ans: velocity
(Q).
Answer the following question given this paragraph: Look at the Figure below of water (H 2 O) and hydrogen peroxide (H 2 O 2 ), and read about these two compounds. Both compounds consist of hydrogen and oxygen, but they have different ratios of the two elements. As a result, water and hydrogen peroxide are different compounds with different properties. If you've ever used hydrogen peroxide to disinfect a cut, then you know that it is very different from water!. Q: What elements do water and hydrogen peroxide consist of? Choices: - carbon and oxygen - calcium and oxygen - hydrogen and helium - hydrogen and oxygen A:
(A).
hydrogen and oxygen
Ques:Answer the following question given this paragraph: Has a double-bonded carbon-oxygen bond (one sigma bond and one pi bond). The carbon to which the oxygen is attached has one hydrogen atom connected to it. Q: Which type of double bond has a sigma bond and a pi bond? Choices: - dioxide - oxygen bond - Covalent Bonds - sodium - oxygen bond - carbon-oxygen bond A:

Ans:carbon-oxygen bond
Question: Answer the following question given this paragraph: For all collisions in a closed system, momentum is conserved. In some collisions in a closed system, kinetic energy is conserved. When both momentum and kinetic energy are conserved, the collision is called an elastic collision. Most collisions are inelastic because some amount of kinetic energy is converted to potential energy, usually by raising one of the objects higher (increasing gravitation PE) or by flexing the object. Any denting or other changing of shape by one of the objects will also be accompanied by a loss of kinetic energy. The only commonly seen elastic collisions are those between billiard balls or ball bearings, because these balls do not compress. And, of course, collisions between molecules are elastic if no damage is done to the molecules. Q: When both momentum and kinetic energy are conserved in a closed system, the collision is called what? Choices: - a static collision - a spontaneous collision - an accidental collision - an elastic collision A:
Answer:
an elastic collision