Question

1. Which of the following statements is true? (1 point)
-Since all cells carry out cellular respiration, they contain mitochondria.
-A cell cannot be subdivided into smaller units that maintain the living state.
-Plant cells contain chloroplasts and no mitochondria while animal cells contain mitochondria and no chloroplasts.
-The cell membrane’s function is to prevent diffusion of any substances into or out of the cell.

2. A biologist discovers a new unicellular organism and classifies it as a prokaryote. The cell is very small, contains a cell membrane, a cytoplasm, DNA in a nucleus, and no other cell organelles. Which statement below represents a correct response to the biologist’s discovery and classification? (1 point)
-The organism is a prokaryote, because it lacks cell organelles such as mitochondria, Golgi apparatus, and endoplasmic reticulum.
-The organism is a prokaryote, because it is so small and simple in structure.
-The organism is a eukaryote, because it has a nucleus.
-The organism is a eukaryote, because it has a cell membrane, a cytoplasm, and DNA.

3. Which structures are used by the cell for storing and maintaining biological information that will be passed to daughter cells when the cell divides? (1 point)
-nucleus, chromatin
-nucleolus, ribosome
-vacuole, lysosome
-Golgi apparatus, endoplasmic reticulum

4. What problem do organisms that live in fresh water have? (1 point)
-The fluid in their cells is hypotonic with respect to the external environment and so they have to be able to pump water out.
-The fluid in their cells is hypotonic with respect to the external environment and so they have to be able to pump water in.
-The fluid in their cells is hypertonic with respect to the external environment and so they have to be able to pump water out.
-The fluid in their cells is hypertonic with respect to the external environment and so they have to be able to pump water in.

5. What is the role of water in the reactions of photosynthesis? (1 point)
-provides oxygen atoms
-provides electrons
-accepts electrons
-acts as a catalyst

6. The following aquariums were set up with the same volume of water. (Elodea is an aquatic green plant.)
aquarium 1: Elodea only
aquarium 2: Elodea and an aquatic snail
aquarium 3: Aquatic snail only

Which aquariums will establish a cycle of carbon dioxide and oxygen gas flow if placed in the dark for several weeks?

(1 point)
-1, 2, and 3
-2 and 3
-3 only
-none

7. Which of the following are energy carrier molecules involved in photosynthesis? (1 point)
-ATP only
-ATP and NADPH
-ATP, NADH, and FADH2
-NADPH, NADH, and FADH2

8. Which of the following shows the correct order of events during cellular respiration? (1 point)
-pyruvate oxidation, glycolysis, electron transport, Krebs cycle
-glycolysis, Krebs cycle, pyruvate oxidation, electron transport
-glycolysis, pyruvate oxidation, Krebs cycle, electron transport
-pyruvate oxidation, Krebs cycle, glycolysis, electron transport

9. How do the quantities of ATP formed during aerobic and anaerobic respiration compare? (1 point)
-Two times more ATP is formed during aerobic respiration than during anaerobic respiration.
-Four times more ATP is formed during aerobic respiration than during anaerobic respiration.
-Eight times more ATP is formed during aerobic respiration than during anaerobic respiration.
-Seventeen times more ATP is formed during aerobic respiration than during anaerobic respiration.

10. Wine is made by mixing yeast with grapes and allowing the yeast cells to undergo fermentation. Sparkling wine is a type of wine that contains high levels of dissolved carbon dioxide. What is the source of the carbon atoms in the carbon dioxide found in sparkling wine? (1 point)
-ethanol
-lactic acid
-methane
-glucose

Answer 1

1. Which of the following statements is true? (1 point)
-Since all cells carry out cellular respiration, they contain mitochondria. (Prokaryotes do not have mitochondria. Instead glycolysis, acetyl-CoA formation and the Krebs cycle all occur in the cytoplasm. The electron transport system and ATP synthase for electron transport chain and oxidative phosphorylation are embedded in the cell membrane.)

-A cell cannot be subdivided into smaller units that maintain the living state. (This is true as a cell is the basic biological unit of life. Any subdivision would mean that organelles are removed, and these organelles would usually be unable to function as a living unit.)

-Plant cells contain chloroplasts and no mitochondria while animal cells contain mitochondria and no chloroplasts. (It is true that animal cells contain mitochondria and no chloroplasts. However, as plant cells are eukaryotic cells and need to undergo cellular respiration, it is important for them to have mitochondria to for acetyl-CoA formation and the Krebs cycle, as well as electron transport system and ATP synthase for electron transport chain and oxidative phosphorylation.)

-The cell membrane’s function is to prevent diffusion of any substances into or out of the cell. (The cell membrane's function is to prevent diffusion of some substances into or out of the cell. However, this does not mean that it prevents all substances from doing so. One counter-example you could give is chloride ions, which would lead to Cystic Fibrosis if they can't pass through the cell membrane due to mutation of the CFTR gene and a malfunctioning chloride ion channel).

Answer 2

2. A biologist discovers a new unicellular organism and classifies it as a prokaryote. The cell is very small, contains a cell membrane, a cytoplasm, DNA in a nucleus, and no other cell organelles. Which statement below represents a correct response to the biologist’s discovery and classification? (1 point)

-The organism is a prokaryote, because it lacks cell organelles such as mitochondria, Golgi apparatus, and endoplasmic reticulum. (This may be true, but the very fact that there's a nucleus shows otherwise. Prokaryotes have DNA in a region of the cytoplasm known as the nucleoid, which is why transcription and translation can take place simultaneously.)

-The organism is a prokaryote, because it is so small and simple in structure. (Use the counter-example of yeast)

-The organism is a eukaryote, because it has a nucleus. (This statement is true as a nucleus is a cell organelle that indicates to us that it is a eukaryotic cell)

-The organism is a eukaryote, because it has a cell membrane, a cytoplasm, and DNA. (Though its true that the organism has a cell membrane, a cytoplasm, and DNA, all we can conclude that it's an organism. We need more information based on this statement to classify it.)

Answer 3

thanks

Answer 4

could you post these answers?