Q: The energy a chemical reaction needs to get started is called what kind of energy? Read this paragraph and choose the correct option from the provided answers: All chemical reactions, even exothermic reactions, need a certain amount of energy to get started. This energy is called activation energy . For example, activation energy is needed to start a car. Turning the key causes a spark that activates the burning of gasoline in the engine. The combustion of gas won't occur without the spark of energy to begin the reaction. Choices: - function - conduction - fusion - activation A:
activation

Q: What kind of proteins either activate or deactivate the transcription of other genes? Read this paragraph and choose the correct option from the provided answers: What makes the heart form during development? What makes the skin form? What makes a structure become an arm instead of a leg? These processes occur during development because of a highly specific pattern of gene expression. This intensely regulated pattern of gene expression turns genes on in the right cell at the right time, such that the resulting proteins can perform their necessary functions to ensure proper development. Transcription factors play an extremely important role during development. Many of these proteins can be considered master regulatory proteins , in the sense that they either activate or deactivate the transcription of other genes and, in turn, these secondary gene products can regulate the expression of still other genes in a regulatory cascade. Homeobox genes and gap genes are important classes of transcription factors utilized during development. Choices: - carbon proteins - perfect regulatory proteins - master complex proteins - master regulatory proteins A:
master regulatory proteins

Q: How do most reptiles produce? Read this paragraph and choose the correct option from the provided answers: Most reptiles reproduce sexually and have internal fertilization. Males have one or two penises that pass sperm from their cloaca to the cloaca of a female. Fertilization occurs within the cloaca, and fertilized eggs leave the female's body through the opening in the cloaca. In a minority of species, the eggs are retained inside the female's body until they hatch. Then the offspring leave the mother's body through the cloaca opening. Choices: - occasionally - biologically - asexually - sexually A:
sexually