BIO 348- EXAM #1 QUIZ 1 QUESTIONS AND 100% APPROVED CORRECT ANSWERS GRADED A+ 2025 FIRST CLASS PASS

BIO 348- EXAM #1 QUIZ 1 QUESTIONS AND 100% APPROVED CORRECT ANSWERS GRADED A+ 2025 FIRST CLASS PASS 2025 EXAM  BIO 348- EXAM #1 QUIZ 1 QUESTIONS AND 100% APPROVED CORRECT ANSWERS GRADED A+ 2025 FIRST CLASS PASS T or F- Within a developed multicellular organism, all cells possess the ability to divide and do so regularly - CORRECT ANSWER False, because some cells lose the ability to replicate their DNA and divide. What is a drawback to using electron microscopy? Choose one: A. It can be used only to view atomic details in structures larger than a ribosome. B. It requires the use of fluorescent probes. C. It can be used only to view samples that are sliced very thinly. D. It cannot be used to view a whole cell or organism. E It cannot be used to view living cells. - CORRECT ANSWER E. It cannot be used to view living cells. Which of these cannot be resolved within a conventional light microscope? A. embryonic cell B. bacterium C. cell nucleus D. ribosome E. mitochondrion - CORRECT ANSWER Ribosome, a light microscope has a resolution of about .2 micrometers and a ribosome is approximately 20 nanometers In 1970, Frye and Edidin published research describing the mobility of plasma membrane proteins. They fused mouse and human cells together, creating a hybrid cell, and then examined the localization of mouse and human proteins over time. Initially mouse and human proteins were each restricted to one-half of the heterokaryon, but over time the mouse and human proteins mixed, with each being present over the entire cell surface. What technique did Frye and Edidin likely use to examine the mouse and human proteins? Choose one: A. fluorescence microscopy B. scanning electron microscopy C. interference contrast light microscopy D. transmission electron microscopy - CORRECT ANSWER Fluorescent microscope Which statement represents the cell theory? A. All cells are formed by the growth and division of existing cells. B. All cells require a continual input of energy to sustain life. C. All cells resemble square or rectangular chambers. D. All cells contain DNA. E. All cells can be seen using a microscope. - CORRECT ANSWER A. All cells are formed by the growth and division of existing cells Which is not evidence for the endosymbiosis origins of mitochondria and chloroplasts? A. Mitochondria and chloroplasts are each surrounded by a double membrane. B. Mitochondria and chloroplasts reproduce by dividing in two. C. Mitochondria and chloroplasts contain their own DNA. D. Mitochondria and chloroplasts resemble bacteria. E. Mitochondria and chloroplasts have similar DNA. - CORRECT ANSWER E. Mitochondria and chloroplasts have similar DNA. The origins of mitochondria and chloroplasts suggest that these organelles arose from separate instances of the developing/evolving primitive eukaryotic cell engulfing a smaller bacterial cell. Mitochondria are essentially the same in all eukaryotes including plants, animals, and fungi. Based on this observation, how were mitochondria most likely acquired? Choose one: A. by a prokaryotic cell approximately 1000 years ago B. by an ancestral prokaryote and then lost in the line that led to archaea C. from a free-living, photosynthetic bacterium D. by an ancestral eukaryotic cell and then replaced by chloroplasts in the line that led to plant cells E. by an ancestral eukaryotic cell before the lines that led to animal cells, plant cells, and fungi diverged - CORRECT ANSWER D. By an ancestral eukaryotic cell before the lines that led to animal cells, plant cells, and fungi diverged Which statement is not true of chloroplasts? A. Chloroplasts contain their own DNA. B. Chloroplasts are thought to have originated from bacteria. C. Chloroplasts absorb light and generate oxygen and carbohydrate. D. Each has an internal stack of membranes and is enclosed by two membranes. E. Chloroplasts are present in essentially all eukaryotic cells and in certain photosynthetic bacteria. - CORRECT ANSWER E. Chloroplasts are present in essentially all eukaryotic cells and in certain photosynthetic bacteria. Which statement is not true of mitochondria? A. Mitochondria contain their own DNA. B. Mitochondria are not present in plant cells. C. Mitochondria are involved in the chemical energy cycle of the cell. D. Mitochondria have an inner and outer membrane. E. Mitochondria are thought to have originated from bacteria. - CORRECT ANSWER C. Mitochondria are not present in plant cells Is the following statement true, false, or impossible to determine? Photosynthetic bacteria contain chloroplasts - CORRECT ANSWER False Scientists were studying yeast cells in which a mutation inactivated a gene required for cell division. Without this gene—and the protein it encoded—these mutant yeast cells were unable to