Answer the following question given this paragraph: Most ocean mollusks have a gill or gills to absorb oxygen from the water. Q: What do ocean mollusks use to absorb oxygen from the water? Choices: - shells - scales - pores - gills A:
gills
(Question)
Answer the following question given this paragraph: Ethers are composed of an oxygen atom that forms single bonds with two carbon atoms. Ethers are relatively unreactive making them good solvents for other organic compounds, such as in the formation of anesthetics. Q: What are composed of an oxygen atom that forms single bonds with two carbon atoms? Choices: - sugars - solvents - acids - ethers A:
(Answer)
ethers
Ques: Answer the following question given this paragraph: All of our cells contain DNA. Meiosis ensures that each gamete receives a copy of each chromosome. Q: What process within cells makes sure that every gamete receives a copy of every chromosome? Choices: - genomes - fission - mutations - meiosis A:
Ans: meiosis
(Q).
Answer the following question given this paragraph: Cells that divide uncontrollably may form a tumor , or abnormal mass of cells. Tumors may be benign or malignant. Benign tumors remain localized and generally do not harm health. Malignant tumors are cancerous. There are no limits to their growth, so they can invade and damage neighboring tissues. Cells from malignant tumors may also break away from the tumor and enter the bloodstream. They are carried to other parts of the body, where new tumors may form. The most common and the most deadly cancers for U. S. adults are listed in Table below . Q: What do you call an abnormal mass of cells that is dividing improperly? Choices: - bumps - appendages - molars - tumor A:
(A).
tumor
Ques:Answer the following question given this paragraph: Role of Feedback Loops The contribution of feedback loops to homeostasis will only be briefly reviewed here. Positive feedback loops are characterized by the release of additional hormone in response to an original hormone release. The release of oxytocin during childbirth is a positive feedback loop. The initial release of oxytocin begins to signal the uterine muscles to contract, which pushes the fetus toward the cervix, causing it to stretch. This, in turn, signals the pituitary gland to release more oxytocin, causing labor contractions to intensify. The release of oxytocin decreases after the birth of the child. The more common method of hormone regulation is the negative feedback loop. Negative feedback is characterized by the inhibition of further secretion of a hormone in response to adequate levels of that hormone. This allows blood levels of the hormone to be regulated within a narrow range. An example of a negative feedback loop is the release of glucocorticoid hormones from the adrenal glands, as directed by the hypothalamus and pituitary gland. As glucocorticoid concentrations in the blood rise, the hypothalamus and pituitary gland reduce their signaling to the adrenal glands to prevent additional glucocorticoid secretion (Figure 17.6). Q: By allowing blood levels of a hormone to be regulated within a narrow range, feedback loops contribute to maintaining what state? Choices: - hypothesis - hibernation - consciousness - homeostasis A:

Ans:homeostasis
Answer the following question given this paragraph: The direct conversion of a solid to a gas, without an intervening liquid phase, is calledsublimation. The amount of energy required to sublime 1 mol of a pure solid is theenthalpy of sublimation (Hsub). Common substances that sublime at standard temperature and pressure (STP; 0C, 1 atm) include CO2 (dry ice); iodine (Figure 11.18 "The Sublimation of Solid Iodine"); naphthalene, a substance used to protect woolen clothing against moths; and 1,4-dichlorobenzene. As shown in Figure 11.17 "The Three Phases of Matter and the Processes That Interconvert Them When the Temperature Is Changed", the enthalpy of sublimation of a substance is the sum of its enthalpies of fusion and vaporization provided all values are at the same T; this is an application of Hess's law. (For more information about Hess's law, see Chapter 5 "Energy Changes in Chemical Reactions", Section 5.2 "Enthalpy"). Equation 11.3. Q: The direct conversion of a solid to a gas, without an intervening liquid phase, is called what? Choices: - amplification - isolation - insertion - sublimation A:
sublimation