Nokea
Aerobic respiration occurs in the presence of what necessary molecule?
- A. Carbon Dioxide
- B. Water
- C. Glucose
- D. Oxygen
Correct Answer: D
Rationale: Oxygen is essential for aerobic respiration as it acts as the final electron acceptor in the electron transport chain, producing ATP
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What type of cells are without a true nucleus?
- A. Complex.
- B. Eukaryotic.
- C. Prokaryotic.
- D. Simple.
Correct Answer: C
Rationale: The correct answer is C: Prokaryotic. Prokaryotic cells lack a true nucleus and their genetic material is not enclosed within a membrane-bound nucleus. This is a defining characteristic of prokaryotic cells, distinguishing them from eukaryotic cells (choice B), which have a true nucleus. Complex cells (choice A) and simple cells (choice D) are vague terms that do not specifically address the presence or absence of a true nucleus. Prokaryotic cells, such as bacteria, have a simpler internal structure compared to eukaryotic cells, making them distinct in terms of genetic organization and cellular complexity.
Enzymes are typically...
- A. Fats
- B. Proteins
- C. Sugars
- D. Neurons
Correct Answer: B
Rationale: Enzymes are typically proteins, not fats, sugars, or neurons. Proteins are large molecules made up of amino acids and are the most common type of enzymes. Enzymes play a crucial role in catalyzing biochemical reactions in living organisms by speeding up these reactions without being consumed in the process.
How many different types of nucleotides are there in DNA?
- A. one
- B. two
- C. four
- D. eight
Correct Answer: C
Rationale: The correct answer is C: four. DNA is composed of four different types of nucleotides: adenine (A), thymine (T), cytosine (C), and guanine (G). These nucleotides pair specifically (A with T and C with G) to form the double-stranded DNA structure.
Why doesn't an antibiotic work for treating flu symptoms in a patient?
- A. The antibiotic is for a different type of infection, not the flu.
- B. The antibiotic is not effective in treating viral infections like the flu.
- C. The antibiotic is not administered in a sufficient dosage to combat the flu.
- D. None of the above
Correct Answer: B
Rationale: Antibiotics are designed to treat bacterial infections, not viral infections like the flu. The flu is caused by a virus, so antibiotics are ineffective in treating flu symptoms. To effectively manage and treat flu cases, antiviral medications specifically designed to target viral infections should be used.
What is the term for movement of water across a cellular membrane?
- A. Osmosis.
- B. Facilitated diffusion.
- C. Diffusion.
- D. Active transport.
Correct Answer: A
Rationale: Correct Answer: A - Osmosis
Rationale:
1. Osmosis is the movement of water across a selectively permeable membrane from an area of low solute concentration to high solute concentration.
2. Water moves passively to equalize solute concentrations on both sides of the membrane.
3. Facilitated diffusion (B) involves the use of transport proteins, not specific to water movement.
4. Diffusion (C) is the movement of solutes, not specific to water.
5. Active transport (D) requires energy to move molecules against their concentration gradient, different from osmosis.