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Home Question Bank Biology Archive 2025 January 16

Biology Questions from Jan 16,2025

Browse the Biology Q&A Archive for Jan 16,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Bone marrow contains massive numbers of stem cells but most somatic stem cells sit among large numbers of differentiated cells. Somatic stem cells have been found in many other tissues, including brain, blood, blood vessels, muscle, skin, teeth, heart, gut, and liver. As we grow from fertilized eggs into fully formed human beings, stem cells give rise to throughout our lives as they help to Part 1: The Nature of Stem Cells (as a class) Website: htto.//leam.eenetics.utah.edu/content/tech/stemcells/scintro/ Our bodies contain many specialized cells that carry out specific functions. These specialized cells are called \( \qquad \) In contrast, a stem cell is \( \qquad \) ; its role in the body is \( \qquad \) . A stem cells can give rise to \( \qquad \) including more stem cells. Stem cells play an important role in our bodies, from embryonic development through adulthood. Development begins when sperm and egg meet. This event produces a \( \qquad \) \( \qquad \) , as well as the placenta, which will nourish the embryo as it grows. For the first few divisions, all the cells remain \( \qquad \) ; each one has the same potential as the fertilized egg. As development continues, a series of instructions - or signals - \( \qquad \) \( \qquad \) \( \qquad \) has begun. One week after fertilization, the embryo, now called the blastocyst, looks like a lopsided hollow ball. The cells around the outside of the ball will form the placenta. A clump on the inside, called the inner cell mass, \( \qquad \) About 2 weeks after fertilization, the cells of the embryo organize into three layers. Cell signals restrict the potential of these cells even further: \( \qquad \) A few weeks later, the cells of the outer layer (or ectoderm) have become skin, nervous system, and parts of the face and neck. The middle layer (or mesoderm) has become muscle, blood, blood vessels, and the beginnings of bones and connective tissue. The inner layer (or endoderm) has begun to form the digestive and respiratory tracts and the glands that feed into them, including the pancreas and the liver. As development continues, \( \qquad \) But even after birth and into adulthood, \( \qquad \) These somatic (or adult) stem cells play an important role in growth, maintenance, and repair. Some stem cells sit quietly, \( \qquad \) ; others are \( \qquad \) replacing cells that are lost through daily wear and tear. Somatic stem cells differ from embryonic stem cells; under natural conditions, \( \qquad \) \( \qquad \) For example, bone marrow stem cells give rise most often to blood cells. Bone marrow contains massive numbers of stem cells but most somatic stem cells sit among large numbers of differentiated cells. Somatic stem cells have been found in many other tissues, including brain, blood, blood vessels, muscle, skin, teeth, heart, gut, and liver. As we grow from fertilized eggs into fully formed human beings, stem cells give rise to \( \qquad \) \( \qquad \) Stem cells continue to play an important role throughout our lives as they help to \( \qquad \) 3 STEM Herbivores are animals that eat only plants. Carnivores are animals that eat only meat. In general, herbivores sleep less than carnivores. For example, giraffes in the wild sleep about \( \frac{1}{6} \) of the day. In contrast, lions in the wild sleep about \( \frac{3}{4} \) of the day. Which animal is the herbivore? Use a benchmark fraction to explain your thinking. Organism is another word for "living thing." True False \begin{tabular}{l} Match the definition to the correct term. \\ \begin{tabular}{l} Transmission of heredity information from one generation to \\ the next. \\ Maintenance of a stable internal environment. \\ Changes in an organism that take place over time. \\ Reaction to a change in the environment. \\ Cell enlargement and division. \\ \hline The basic unit is the cell. \\ \hline\end{tabular} \\ \hline\end{tabular} True or False 1 point By studying biology, you can better appreciate the great diversity of species on Earth and the way each species fits into the dynamic pattern of life on Earth. True False 4. How are food webs different to food chains? Explain why food webs are more useful. 9. Which of the following is the output of Transcription? ¿Cuál de los siguientes es el resultado de la transcripción? Mark only one oval. A. Transfer RNA (tRNA) A. Transferencia de ARN (ARNt) B. Messenger RNA (mRNA) B. ARN mensajera (ARNm) C. Amino Acids / Proteins C. Aminoácidos/Proteínas D. DNA D. DNA 8. Which of the following is the input of Translation? ¿Cuál de las siguientes es la entrada de la traducción? Mark only one oval. A. Transfer RNA (tRNA) B. Messenger RNA (mRNA) C. Amino Acids / Proteins D. DNA 7. Which of the following is the input of Transcription? ¿Cuál de las siguientes es la entrada de Transcripción? Mark only one oval. A. Transfer RNA (tRNA) Transferencia de ARN (ARNt) C. Amino Acids / Proteins D. DNA
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