Answer the following question given this paragraph: Chemoheterotrophs are organisms that get their energy source and carbon source from organic sources. Chemoheterotrophs must consume organic building blocks that they are unable to make themselves. Most get their energy from organic molecules such as sugars. This nutritional mode is very common among eukaryotes, including humans. Q: Which organisms get their energy source and carbon source from organic sources? Choices: - herbivores - ectomorphs - sporozoans - chemoheterotrophs A:
chemoheterotrophs
(Question)
Answer the following question given this paragraph: Introduction All life on Earth is related. Evolutionary theory states that humans, beetles, plants, and bacteria all share a common ancestor, but that millions of years of evolution have shaped each of these organisms into the forms seen today. Scientists consider evolution a key concept to understanding life. Natural selection is one of the most dominant evolutionary forces. Natural selection acts to promote traits and behaviors that increase an organism's chances of survival and reproduction, while eliminating those traits and behaviors that are to the organism's detriment. But natural selection can only, as its name implies, selectit cannot create. The introduction of novel traits and behaviors falls on the shoulders of another evolutionary forcemutation. Mutation and other sources of variation among individuals, as well as the evolutionary forces that act upon them, alter populations and species. This combination of processes has led to the world of life we see today. Q: Natural selection cannot create new variations in organisms - these new variations must be created by what, which are usually associated with some sort of abnormality? Choices: - radiation - infection - pollution - mutation A:
(Answer)
mutation
Ques: Answer the following question given this paragraph: Serge Melki (Flickr:Serge Melki). The burning of charcoal is a combustion reaction . CC BY 2.0. Q: The burning of charcoal is what type of reaction? Choices: - condensation - physical - evaporation - combustion A:
Ans: combustion
(Q).
Answer the following question given this paragraph: The Nuclear Envelope The nuclear envelope is a double-membrane structure that constitutes the outermost portion of the nucleus ( Figure 4.11). Both the inner and outer membranes of the nuclear envelope are phospholipid bilayers. The nuclear envelope is punctuated with pores that control the passage of ions, molecules, and RNA between the nucleoplasm and cytoplasm. The nucleoplasm is the semi-solid fluid inside the nucleus, where we find the chromatin and the nucleolus. Chromatin and Chromosomes To understand chromatin, it is helpful to first consider chromosomes. Chromosomes are structures within the nucleus that are made up of DNA, the hereditary material. You may remember that in prokaryotes, DNA is organized into a single circular chromosome. In eukaryotes, chromosomes are linear structures. Every eukaryotic species has a specific number of chromosomes in the nuclei of its body's cells. For example, in humans, the chromosome number is 46, while in fruit flies, it is eight. Chromosomes are only visible and distinguishable from one another when the cell is getting ready to divide. When the cell is in the growth and maintenance phases of its life cycle, proteins are attached to chromosomes, and they resemble an unwound, jumbled bunch of threads. These unwound protein-chromosome complexes are called chromatin ( Figure 4.12); chromatin describes the material that makes up the chromosomes both when condensed and decondensed. Q: What is the double-membrane structure that constitutes the outermost portion of the nucleus? Choices: - energy fold - nuclear fold - energy envelope - nuclear envelope A:
(A).
nuclear envelope
Ques:Answer the following question given this paragraph: Combinations of different substances are called mixtures. Q: What are the two components of a mixture called? Choices: - nutrients and a solvent - acid and base - concentration and a solvent - solute and a solvent A:

Ans:solute and a solvent
Answer the following question given this paragraph: isolating the individual components, preservationists are better able to determine the condition of an object and those books and documents most in need of immediate protection. The simplest class of organic compounds is the hydrocarbons, which consist entirely of carbon and hydrogen. Petroleum and natural gas are complex, naturally occurring mixtures of many different hydrocarbons that furnish raw materials for the chemical industry. The four major classes of hydrocarbons are the alkanes, which contain only carbonhydrogen and carboncarbon single bonds; the alkenes, which contain at least one carboncarbon double bond; the alkynes, which contain at least one carboncarbon triple bond; and the aromatic hydrocarbons, which usually contain rings of six carbon atoms that can be drawn with alternating single and double bonds. Alkanes are also called saturated hydrocarbons, whereas hydrocarbons that contain multiple bonds (alkenes, alkynes, and aromatics) are unsaturated. Q: The simplest class of organic compounds is the what? Choices: - particles - Phenols - gas - hydrocarbons A:
hydrocarbons