Food provides energy to animal cells, whereas sunshine provides energy to plant cells. Chemicalenergy, which is the energy held in the bonds that connect the atoms of every molecule, is used by all cells. Cells must be able to release the chemical energy in the connections in order to continue to function.
The smallest unit in biology that can sustain life on its own and makes up all living things as well as the body's tissues.
After using a very early microscope to examine a piece of cork, Robert Hooke proposed the name "cell" in 1665, derived from the Latin cella, which means "storeroom or chamber."
It is also claimed that he believed the rectangular spaces resembled some monasticcells.
Animal cells get their energy from food, but plant cells get their energy from sunlight. All cells employ chemicalenergy, which is the energy stored in the bonds that bind the atoms of every molecule.
To keep working, cells need to be able to discharge the chemical energy stored in their connections.
Thus, this way, plants and animal cells obtain their energy.
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Plant cells obtain their energy by making their own food through the process of photosynthesis. Photosynthesis is a process by which carbon dioxide , water and light energy are utilized by plants to make energy-rich carbohydrates such as glucose. Plants store up the glucose as starch in their tissues. When plant cells needs energy, they simply take glucose molecules from their store of starch and use it in cellular respiration to produce ATP, the form of energy that the cell uses to function.
Animals on the other hand do not make their own food but ingest ready made food and break it down into its simplest units through the process of digestion. Complex carbohydrates are broken down to glucose units. Glucose is directly taken in by the animal cells where it is used in cellular respiration to produce ATP ,which fuels the cell activities.
the correct answer is d. Amount of fertilizer. The independentvariable is the variable that is deliberately changed or manipulated in an experiment to see its effect on the dependent variable.
In this experiment, the independent variable is the amount of fertilizer or compost added to the tomato plants, as it is the variable being intentionally varied to test the hypothesis. Therefore, the correct answer is d. Amount of fertilizer. The dependent variable in this experiment is plantgrowth, which is the variable being measured to determine the effect of the independent variable. The other variables mentioned, time of experiment and amount of water, are likely held constant throughout the experiment as part of the experimental design, and therefore do not serve as independent variables.
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B. Helicase attaches new nitrogen bases to the ends of old DNA strands, while DNA polymerase breaks down unused DNA strands
C . DNA polymerase breaks down the old strand of DNA after a new one has been replicated, while helicase connects the two DNA strands together
D. Helicase "unzips" the DNA strand, while DNA polymerase brings in new strands of DNA to match the old strands
'Helicase "unzips" the DNA strand, while DNA polymerase brings in new strands of DNA to match the old strands.' best describes the role of helicase and DNA polymerase in DNA replication. The correct option is d.
Helicase is essential for DNA replication because it "unzips" the double-stranded DNA molecule. In order to separate the two strands and create a replication fork this process involves severing hydrogen bonds between the base pairs. On the other hand, DNA polymerase is charged with the vital task of creating new DNA strands.
It does this by incorporating complementary nucleotides into the template strands already present. This maintains genetic fidelity by ensuring that the newly formed strands mirror the original ones. The precise duplication of genetic information which is necessary for cell division and inheritance, depends on the interaction between the unwinding action of the helicase and the strand-building activity of DNA polymerase.
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genetic drift
microevolution
stabilizing selection
Genetic drift is the random changes in allele frequency in a population.
Random changes in allele frequency in a population are called genetic drift. Genetic drift refers to the random fluctuations in the frequencies of alleles in a population, caused by random sampling effects. It is one of the mechanisms of microevolution, which refers to the changes in allele frequencies within a population over time. It is different from gene flow and stabilizing selection, which are also mechanisms of microevolution.
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