Q: What is the energy needed to start a reaction between catalysts and reactants called? Read this paragraph and choose the correct option from the provided answers: Catalysts interact with reactants so the reaction can occur by an alternate pathway that has a lower activation energy. Activation energy is the energy needed to start a reaction. When activation energy is lower, more reactant particles have enough energy to react so the reaction goes faster. Many catalysts work like the one in the Figure below . (You can see an animated version at the following URL. ) The catalyst brings the reactants together by temporarily bonding with them. This makes it easier and quicker for the reactants to react together. Notice how the catalyst is released by the product molecule at the end of the reaction. Choices: - reaction energy - decomposition energy - conductivity energy - activation energy A:
activation energy

(Question)
Q: What is the final stage of cell division in eukaryotes as well as prokaryotes? Read this paragraph and choose the correct option from the provided answers: Cytokinesis is the final stage of cell division in eukaryotes as well as prokaryotes. During cytokinesis, the cytoplasm splits in two and the cell divides. Cytokinesis occurs somewhat differently in plant and animal cells, as shown in Figure below . In animal cells, the plasma membrane of the parent cell pinches inward along the cell's equator until two daughter cells form. In plant cells, a cell plate forms along the equator of the parent cell. Then, a new plasma membrane and cell wall form along each side of the cell plate. Choices: - mitosis - electrolysis - anaphase - cytokinesis A:
(Answer)
cytokinesis

Ques: Q: Each muscle fiber contains hundreds of organelles called what? Read this paragraph and choose the correct option from the provided answers: Each muscle fiber contains hundreds of organelles called myofibrils. Each myofibril is made up of two types of protein filaments: actin filaments, which are thinner, and myosin filaments, which are thicker. Actin filaments are anchored to structures called Z lines (see Figure below ). The region between two Z lines is called a sarcomere. Within a sarcomere, myosin filaments overlap the actin filaments. The myosin filaments have tiny structures called cross bridges that can attach to actin filaments. Choices: - fast glycolytic fibres - slow twitch fibres - pores - myofibrils A:
Ans: myofibrils

(Q).
Q: What structure of the heart receives oxygen-poor blood from the body, then pumps the blood into the right ventricle? Read this paragraph and choose the correct option from the provided answers: One path of blood in the heart is through the right atrium and right ventricle. The right atrium receives oxygen-poor blood from the body. It pumps the blood into the right ventricle. Then the right ventricle pumps the blood out of the heart to the lungs. This path through the heart is part of the pulmonary circulation. Choices: - left ventricle - right ventricle - left atrium - right atrium A:
(A).
right atrium

Ques:Q: The mild oxidation of thiols gives compounds called what? Read this paragraph and choose the correct option from the provided answers: Thiols (also called mercaptans), which are sulfur analogs of alcohols, have the general formula RSH. Methanethiol (also called methyl mercaptan), has the formula CH3SH. Ethanethiol (ethyl mercaptan) is the most common odorant for liquid propane (LP) gas. The mild oxidation of thiols gives compounds called disulfides. Choices: - carbonates - halides - dioxides - disulfides A:

Ans:disulfides

Question: Q: Ions that contain fewer electrons than protons have a net positive charge and are called what? Read this paragraph and choose the correct option from the provided answers: Ionic Compounds The substances described in the preceding discussion are composed of molecules that are electrically neutral; that is, the number of positively charged protons in the nucleus is equal to the number of negatively charged electrons. In contrast, ions are atoms or assemblies of atoms that have a net electrical charge. Ions that contain fewer electrons than protons have a net positive charge and are called cations. Conversely, ions that contain more electrons than protons have a net negative charge and are called anions. Ionic compounds contain both cations and anions in a ratio that results in no net electrical charge. Choices: - oxides - particles - anions - cations A:
Answer:
cations