Nokea
Which is an example of the comet organizational hierarchy for a wolf?
- A. Muscle tissue, blood cell, DNA, organ, circulatory system, wolf.
- B. Circulatory system, DNA, muscle tissue, blood cell, heart, wolf.
- C. Blood cell, organ, circulatory system, muscle tissue, DNA, wolf.
- D. DNA, blood cell, muscle tissue, heart, circulatory system, wolf.
Correct Answer: D
Rationale:
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Which of the following organelles is responsible for producing cell energy?
- A. Mitochondrion and chloroplast
- B. Mitochondrion and nucleus
- C. Chloroplast and nucleus
- D. Chloroplast and lysosome
Correct Answer: A
Rationale: The correct answer is A: Mitochondrion and chloroplast. Mitochondria are known as the powerhouse of the cell as they produce the majority of a cell's energy in the form of ATP (adenosine triphosphate) through aerobic respiration. Chloroplasts, found in plant cells, are responsible for photosynthesis, a process that converts light energy into chemical energy in the form of glucose. Therefore, both mitochondria and chloroplasts play crucial roles in energy production in cells.
Enzymes can ................. reactions.
- A. Catalyze
- B. Inhibit
- C. Stop
- D. None of the above
Correct Answer: A
Rationale: Enzymes function to catalyze reactions, which means they accelerate the rate of chemical reactions without being consumed in the process. Enzymes do not inhibit or stop reactions; instead, they facilitate and enable reactions to occur more efficiently. Therefore, the correct answer is 'Catalyze.'
In the example provided in question 23, which type of solution is the egg placed in?
- A. Hypertonic
- B. Isotonic
- C. Hypotonic
- D. None of the above
Correct Answer: A
Rationale: When an egg is placed in a hypertonic solution, there is a higher concentration of solutes outside the egg compared to inside. This concentration gradient causes water to move out of the egg through osmosis, leading to the egg shrinking or shriveling due to the loss of water. Therefore, the correct answer is 'Hypertonic.'
What type of bond connects sugar and phosphate in DNA?
- A. hydrogen
- B. ionic
- C. covalent
- D. overt
Correct Answer: C
Rationale: The correct answer is covalent (Choice C). In DNA, the bond connecting the sugar and phosphate groups is a phosphodiester bond, which is a type of covalent bond. Covalent bonds involve the sharing of electrons between atoms, forming strong and stable connections. Hydrogen bonds are important in DNA structure but are not the primary bond connecting sugar and phosphate. Ionic bonds involve the transfer of electrons between atoms, which is not the case in sugar-phosphate bonds. 'Overt' is not a term used to describe the bond between sugar and phosphate in DNA.
Which cellular component contributes to the protection, communication, and passage of substances into and out of the cell?
- A. Nucleus
- B. Cell membrane
- C. Endoplasmic reticulum
- D. Cytoplasm
Correct Answer: B
Rationale: The cell membrane is responsible for protecting the cell, facilitating communication with the external environment, and controlling the passage of substances into and out of the cell. It acts as a barrier, regulating the entry and exit of molecules to maintain the cell's internal environment. The nucleus, endoplasmic reticulum, and cytoplasm have their own distinct functions within the cell but do not primarily serve the purposes mentioned in the question.