As they flow over rotten logs as a fluid sheet, slime molds appear to lack any partitioning into cell units; however, slime molds do become cellular when they change form to produce spores. The surface of some parasitic flatworms and some insect tissues are a 'syncytium' or layer of living material that contains many nuclei and cell organelles but lacks partitioning by cell membranes.

• Chapter 3 Cell Structure And Function Study Guide Answers
• Cell Structure And Function Worksheet Answer Key

These tissues consume food and produce wastes. In light of the cell theory that 'all living things are composed of cells,' then A. These tissues are not living because they are not cellular. These tissues are obviously a bridge between nonliving and primitive living cells. The general concept of life-is-cellular still holds because these organisms are cellular at specific stages in their life cycle, but this shows that cell membrane partitions can be abandoned. This proves that a 'vital force' beyond cell chemistry can give life to substances. All of the choices are true.

An amino sugar called N-acetylmuramic acid is an important building block of the cell wall of some bacteria. Penicillin prevents this amino sugar from being incorporated into the bacterial cell wall. Therefore, A. Penicillin affects bacteria but not eukaryotes because eukaryotic cell walls are different. Bacterial cells that had already formed their cell walls would be unaffected. Penicillin would stop the growth of active colonies of susceptible bacteria. All of the choices are correct.

Most bacteria live in a solution that is hypotonic relative to the cytoplasm of the bacteria. The cell wall of a bacterium is a peptidoglycan polymer that is tightly cross-linked.

This would therefore function to A. Regulate the flow of most molecules into and out of the bacterial cell. Provide a rigid wall that prevents the cell from swelling.

Provide a rigid wall that prevents the cell from shrinking. Confirm a close relationship to plant cells that have a similar structure and live in hypotonic solutions. Make all bacteria fairly uniform in metabolic chemistry.

Which of the following is NOT offered as evidence in support of the endosymbiotic theory, the belief that a eukaryotic cell has evolved as a 'committee' of prokaryotic cells? Mitochondria and chloroplasts are similar in size and structure to some species of bacteria. The ribosomes of chloroplasts and mitochondria are similar to bacteria.

Mitochondria and chloroplasts can actively break away from eukaryotic cells and live on their own. Mitochondria and chloroplasts have their own DNA coding separate from the eukaryotic nucleus. All of the choices offer support of the endosymbiotic theory. The springtail is a very common small insect that lives in rotten logs, rich soil, and other humid places. Its cuticle is water repelling (hydrophobic) except for a strange organ, the collophore, on its ventral side. Because it lacks the excretory organs of other insects, the springtail has this organ in contact with the water (it is responsible for ion balance and secretion of wastes). If we examined the cell structure of this collophore, we would expect to find a high number of A.

Golgi bodies. Each time the water in a cell freezes slowly, long sharp crystals spear through the membrane structures of the cell. However, in the frozen state, virtually no chemical reactions occur. The most likely explanation for the bad taste of meat that has 'freezer burn' from repeated freezing is the destruction of A. The Golgi bodies and their vesicles.

Lysosomes and resultant autodigestion. Rough endoplasmic reticulum causing the release of ribosomes. Ribosomes causing them to break into subunits. The nuclear membrane causing mixing of nucleoplasm and cytoplasm. Cell biologists have introduced radioactively labeled carbohydrates, fats and amino acids to living cells, allowed time for cell metabolism, and then disrupted the cells in a blender and separated out the various cell organelles from the cytoplasm. They found the radioactive molecules could soon be detected as part of various cellular compounds, although the visible cell structures appeared unchanged.

This leads us to conclude that A. These 'food' molecules are used only for energy.

Most cell components are constantly being broken down and rebuilt. Radioactivity was transferred from the introduced molecules to the resident stable molecules.

Molecules diffuse at random through the cytoplasm and into cell organelles. Radioactivity has an unusual role in metabolism of living cells. From your knowledge of the size and density of cell components and the process of centrifugation, predict the order (from first to last) that the nucleus and organelles will be extracted? Ribosomes-mitochondria and chloroplasts-nucleus-soluble cytoplasm B. Nucleus-mitochondria and chloroplasts-ribosomes-soluble cytoplasm C. Nucleus-mitochondria and chloroplasts-soluble cytoplasm-ribosomes D.

Mitochondria and chloroplasts-nucleus-soluble cytoplasm-ribosomes E. Soluble cytoplasm-ribosomes-mitochondria and chloroplasts-nucleus. Why is a large surface area: volume ratio needed for cells to function properly? 1993 eagle summit wagon. Adequate surface area (plasma membrane) is needed to furnish nutrients to and expel wastes from the volume (cytoplasm). Smaller volumes reduce and larger surface areas reduce the cell's ability to bring nutrients in and get rid of waste.

A smaller surface area allows the cell to increase its metabolic activity by bringing in even more nutrients than larger surface areas. The surface area and volume increase at the rate to ensure cell growth and reproduction.

As they flow over rotten logs as a fluid sheet, slime molds appear to lack any partitioning into cell units; however, slime molds do become cellular when they change form to produce spores. The surface of some parasitic flatworms and some insect tissues are a 'syncytium' or layer of living material that contains many nuclei and cell organelles but lacks partitioning by cell membranes. These tissues consume food and produce wastes. In light of the cell theory that 'all living things are composed of cells,' then A. These tissues are not living because they are not cellular. These tissues are obviously a bridge between nonliving and primitive living cells.

The general concept of life-is-cellular still holds because these organisms are cellular at specific stages in their life cycle, but this shows that cell membrane partitions can be abandoned. This proves that a 'vital force' beyond cell chemistry can give life to substances. All of the choices are true. An amino sugar called N-acetylmuramic acid is an important building block of the cell wall of some bacteria. Penicillin prevents this amino sugar from being incorporated into the bacterial cell wall. Therefore, A.

Penicillin affects bacteria but not eukaryotes because eukaryotic cell walls are different. Bacterial cells that had already formed their cell walls would be unaffected. Penicillin would stop the growth of active colonies of susceptible bacteria. All of the choices are correct. Most bacteria live in a solution that is hypotonic relative to the cytoplasm of the bacteria. The cell wall of a bacterium is a peptidoglycan polymer that is tightly cross-linked. This would therefore function to A.

Regulate the flow of most molecules into and out of the bacterial cell. Provide a rigid wall that prevents the cell from swelling. Provide a rigid wall that prevents the cell from shrinking. Confirm a close relationship to plant cells that have a similar structure and live in hypotonic solutions. Make all bacteria fairly uniform in metabolic chemistry. Which of the following is NOT offered as evidence in support of the endosymbiotic theory, the belief that a eukaryotic cell has evolved as a 'committee' of prokaryotic cells? Mitochondria and chloroplasts are similar in size and structure to some species of bacteria.

Chapter 3 Cell Structure And Function Study Guide Answers

The ribosomes of chloroplasts and mitochondria are similar to bacteria. Mitochondria and chloroplasts can actively break away from eukaryotic cells and live on their own. Mitochondria and chloroplasts have their own DNA coding separate from the eukaryotic nucleus. All of the choices offer support of the endosymbiotic theory. The springtail is a very common small insect that lives in rotten logs, rich soil, and other humid places. Its cuticle is water repelling (hydrophobic) except for a strange organ, the collophore, on its ventral side.

Because it lacks the excretory organs of other insects, the springtail has this organ in contact with the water (it is responsible for ion balance and secretion of wastes). If we examined the cell structure of this collophore, we would expect to find a high number of A. Golgi bodies. Each time the water in a cell freezes slowly, long sharp crystals spear through the membrane structures of the cell. However, in the frozen state, virtually no chemical reactions occur. The most likely explanation for the bad taste of meat that has 'freezer burn' from repeated freezing is the destruction of A.

The Golgi bodies and their vesicles. Lysosomes and resultant autodigestion. Rough endoplasmic reticulum causing the release of ribosomes.

Ribosomes causing them to break into subunits. The nuclear membrane causing mixing of nucleoplasm and cytoplasm. Cell biologists have introduced radioactively labeled carbohydrates, fats and amino acids to living cells, allowed time for cell metabolism, and then disrupted the cells in a blender and separated out the various cell organelles from the cytoplasm.

They found the radioactive molecules could soon be detected as part of various cellular compounds, although the visible cell structures appeared unchanged. This leads us to conclude that A. These 'food' molecules are used only for energy. Most cell components are constantly being broken down and rebuilt. Radioactivity was transferred from the introduced molecules to the resident stable molecules. Molecules diffuse at random through the cytoplasm and into cell organelles.

Radioactivity has an unusual role in metabolism of living cells. From your knowledge of the size and density of cell components and the process of centrifugation, predict the order (from first to last) that the nucleus and organelles will be extracted? Ribosomes-mitochondria and chloroplasts-nucleus-soluble cytoplasm B. Nucleus-mitochondria and chloroplasts-ribosomes-soluble cytoplasm C. Nucleus-mitochondria and chloroplasts-soluble cytoplasm-ribosomes D. Mitochondria and chloroplasts-nucleus-soluble cytoplasm-ribosomes E.

Soluble cytoplasm-ribosomes-mitochondria and chloroplasts-nucleus. Why is a large surface area: volume ratio needed for cells to function properly? Adequate surface area (plasma membrane) is needed to furnish nutrients to and expel wastes from the volume (cytoplasm). Smaller volumes reduce and larger surface areas reduce the cell's ability to bring nutrients in and get rid of waste.

Cell Structure And Function Worksheet Answer Key

A smaller surface area allows the cell to increase its metabolic activity by bringing in even more nutrients than larger surface areas. The surface area and volume increase at the rate to ensure cell growth and reproduction.