Q: Scientists around the world study speciation, documenting observations both of living organisms and those found in the fossil record. as their ideas take shape and as research reveals new details about how life evolves, they develop models to help explain what? Read this paragraph and choose the correct option from the provided answers: Varying Rates of Speciation Scientists around the world study speciation, documenting observations both of living organisms and those found in the fossil record. As their ideas take shape and as research reveals new details about how life evolves, they develop models to help explain rates of speciation. In terms of how quickly speciation occurs, two patterns are currently observed: gradual speciation model and punctuated equilibrium model. In the gradual speciation model, species diverge gradually over time in small steps. In the punctuated equilibrium model, a new species undergoes changes quickly from the parent species, and then remains largely unchanged for long periods of time afterward (Figure 18.23). This early change model is called punctuated equilibrium, because it begins with a punctuated or periodic change and then remains in balance afterward. While punctuated equilibrium suggests a faster tempo, it does not necessarily exclude gradualism. Choices: - spontaneous mutation - creation theory - food chains - rates of speciation A:
rates of speciation

Q: What are proteins that increase the rate of biochemical reactions? Read this paragraph and choose the correct option from the provided answers: Enzymes are proteins that increase the rate of biochemical reactions. Enzymes aren't changed or used up in the reactions, so they can be used to speed up the same reaction over and over again. Enzymes are highly specific for certain chemical reactions, so they are very effective. A reaction that would take years to occur without its enzyme might occur in a split second with the enzyme. Choices: - metabolites - hormones - amino acids - enzymes A:
enzymes

Q: Q: What type of cell has a singular chromosome, no nucleus, and few other organelles? Read this paragraph and choose the correct option from the provided answers: Cell division is simpler in prokaryotes than eukaryotes because prokaryotic cells themselves are simpler. Prokaryotic cells have a single circular chromosome, no nucleus, and few other organelles. Eukaryotic cells, in contrast, have multiple chromosomes contained within a nucleus and many other organelles. All of these cell parts must be duplicated and then separated when the cell divides. Choices: - trophic - graphic - monophyletic - prokaryotic A:
A: prokaryotic

Question: Q: What is the amide bond that occurs between the amino nitrogen of one amino acid and the carboxyl carbon of another amino acid? Read this paragraph and choose the correct option from the provided answers: A peptide bond is the amide bond that occurs between the amino nitrogen of one amino acid and the carboxyl carbon of another amino acid. The resulting molecule is called a dipeptide. Notice that the particular side chains of each amino acid are irrelevant since the R groups are not involved in the peptide bond. Choices: - a covalent bond - a magnetite bond - a amino bond - a peptide bond A:
Answer: a peptide bond

*Question*
Q: The resultant solution will contain the same amount of solute but a greater amount of what? Read this paragraph and choose the correct option from the provided answers: Many chemicals that we use on a daily basis are transported in a concentrated form but used in a more diluted form. For example, concentrated cleaners are often diluted before they are used. To perform a dilution , pure solvent is added to a concentrated solution in order to make a less concentrated (more dilute) solution. The resultant solution will contain the same amount of solute but a greater amount of solvent. It will therefore have a lower concentration than the original solution. When performing a simple dilution, the concentration and volume of the initial solution are related to the new concentration and volume as follows:. Choices: - calcium - liquid - pigment - solvent A:
**Answer**
solvent

(Question)
Q: Which cycle is named after the scientist melvin calvin? Read this paragraph and choose the correct option from the provided answers: The second stage of photosynthesis takes place in the stroma surrounding the thylakoid membranes of the chloroplast. The reactions of this stage can occur without light, so they are sometimes called light-independent or dark reactions. This stage of photosynthesis is also known as the Calvin cycle because its reactions were discovered by a scientist named Melvin Calvin. He won a Nobel Prize in 1961 for this important discovery. Choices: - krebs cycle - melvin cycle - melcal cycle - calvin cycle A:
(Answer)
calvin cycle