Ques:Q: What are waves that pass a fixed point in a given amount of time called? Read this paragraph and choose the correct option from the provided answers: The number of waves that pass a fixed point in a given amount of time is wave frequency . Wave frequency can be measured by counting the number of crests (high points) of waves that pass the fixed point in 1 second or some other time period. The higher the number is, the greater the frequency of the waves. The SI unit for wave frequency is the hertz (Hz) , where 1 hertz equals 1 wave passing a fixed point in 1 second. The Figure below shows high-frequency and low-frequency transverse waves. You can simulate transverse waves with different frequencies at these URLs: http://phet. colorado. edu/en/simulation/wave-on-a-string and http://zonalandeducation. com/mstm/physics/waves/partsOfAWave/waveParts. htm. Choices: - tendency frequency - combination frequency - radio frequency - wave frequency A:

Ans:wave frequency
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Ques:Q: Programmed cell death, which goes by what term, is important for removing damaged or unnecessary cells? Read this paragraph and choose the correct option from the provided answers: 9.3 Response to the Signal The initiation of a signaling pathway is a response to external stimuli. This response can take many different forms, including protein synthesis, a change in the cell's metabolism, cell growth, or even cell death. Many pathways influence the cell by initiating gene expression, and the methods utilized are quite numerous. Some pathways activate enzymes that interact with DNA transcription factors. Others modify proteins and induce them to change their location in the cell. Depending on the status of the organism, cells can respond by storing energy as glycogen or fat, or making it available in the form of glucose. A signal transduction pathway allows muscle cells to respond to immediate requirements for energy in the form of glucose. Cell growth is almost always stimulated by external signals called growth factors. Uncontrolled cell growth leads to cancer, and mutations in the genes encoding protein components of signaling pathways are often found in tumor cells. Programmed cell death, or apoptosis, is important for removing damaged or unnecessary cells. The use of cellular signaling to organize the dismantling of a cell ensures that harmful molecules from the cytoplasm are not released into the spaces between cells, as they are in uncontrolled death, necrosis. Apoptosis also ensures the efficient recycling of the components of the dead cell. Termination of the cellular signaling cascade is very important so that the response to a signal is appropriate in both timing and intensity. Degradation of signaling molecules and dephosphorylation of phosphorylated intermediates of the pathway by phosphatases are two ways to terminate signals within the cell. Choices: - mytosis - synthesis - mutations - apoptosis A:

Ans:apoptosis
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Ques:Q: What happens when a sperm and an egg cell combine? Read this paragraph and choose the correct option from the provided answers: Sexual reproduction happens when a sperm and an egg cell combine together. This is called fertilization . Sperm are released into the vagina during sexual intercourse. They "swim" through the uterus and enter a fallopian tube . This is where fertilization normally takes place. Choices: - migration - manipulation - stimulation - fertilization A:

Ans:fertilization
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Ques:Q: What occurs when a parent cell splits into two identical daughter cells of the same size? Read this paragraph and choose the correct option from the provided answers: Binary fission occurs when a parent cell splits into two identical daughter cells of the same size. Choices: - linear fission - symbiotic fission - twin fission - binary fission A:

Ans:
binary fission
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