Read the following scenario to answer the following questions.The earliest cells detectable in fossils were different from the cells in animals, plants, fungi, and protists living today. These first prokaryotic cells gave rise to eukaryotic cells approximately 1.7 billion years ago. The structure of eukaryotic cells today suggests how they might have evolved from their prokaryotic ancestors. Scientists examining mitochondria and chloroplasts now think that these organelles were probably free-living prokaryotes before becoming a part of eukaryotic cells long ago.Which of the following is a characteristic of mitochondria that suggests that they might have evolved from free-living bacteria?

Please read the following scenario to answer the following questions.Widow’s peak, a pointed hairline on the forehead, is a genetic trait caused by a dominant allele. It can be traced back through a family’s history using pedigree analysis.The pedigree shown here is of three generations of a family. Notice that some individuals (shown in gray) have a widow’s peak (W = dominant allele and w = recessive allele).This pedigree supports the fact that widow’s peak is due to a dominant allele, because if it were due to a recessive allele and both parents show the recessive phenotype, then ________.

What is a difference between embryonic and adult stem cells?

Which of these is a characteristic of Type I survivorship?

If seed production had never evolved, which organisms would be missing in today’s landscape?

Consider the following figure. It illustrates that a single amino acid substitution in the hemoglobin gene ________.

If adenine makes up 30% of the bases in a DNA double helix, what percent of the bases is guanine?

Please read the following scenario to answer the following questions.While working with cultured mouse cells, a researcher unknowingly treated the cells with a mutagen that causes the deletion or insertion of individual nucleotides in DNA. Subsequently, the researcher isolated and cultured a single cell from this group and noticed that the progeny of this cell were not producing a certain protein and that this affected their survival.The researcher isolated a different single cell and determined that it was producing a certain protein. However, the protein was much shorter than it should have been. What kind of mutation likely occurred in this protein?

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Please read the following scenario and then answer the following questions.Molecular biologists have perfected DNA fingerprinting so that it is possible to use the technique to provide evidence to solve crimes and even identify a child’s parents. Recently, a U.S. immigrant asked the U.S. Citizenship and Immigration Services for permission to have her young daughter who was living with grandparents in their homeland join her in the United States. Her request was denied because there was an apparent mix-up with the child’s birth certificate and it could not be used as proof of maternity. Other forms of proof are required in cases such as this. The mother requested DNA fingerprinting to show that she was the mother of the daughter. Samples of DNA were taken from the mother (Mom) and the daughter (D2) as well as from her daughter (D1) and her son (S) living in the United States with her. STR analysis was run on the three samples, and the results are shown below.  The results indicate that ________.