Nokea
What part of a plant cell acts as a barrier and provides support to the cell?
- A. cell membrane.
- B. Xylem.
- C. chloroplast
- D. Cell wall.
Correct Answer: D
Rationale:
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By what process do sex cells reproduce?
- A. Cytokinesis.
- B. Meiosis.
- C. Mitosis.
- D. Fission.
Correct Answer: B
Rationale:
What is the term for a statement predicting the outcome of an experiment?
- A. Experiment.
- B. Hypothesis.
- C. Conclusion.
- D. Observation.
Correct Answer: B
Rationale: The correct answer is B: Hypothesis. A hypothesis is a statement that predicts the outcome of an experiment based on prior knowledge or observations. It serves as the foundation for the experiment and guides the research process.
A: Experiment - This choice refers to the actual process of conducting a test or investigation, not the prediction of the outcome.
C: Conclusion - This choice pertains to the final result or summary drawn from the experiment after analyzing the data collected, not the initial prediction.
D: Observation - This choice involves gathering and recording data through direct sensory experience, not making a prediction about the experiment's outcome.
Why doesn't an antibiotic work for treating the flu symptoms in a patient?
- A. The antibiotic is for a different type of infection.
- B. The antibiotic is not effective against the flu virus.
- 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 effective against bacterial infections, not viral infections like the flu. Influenza is caused by a virus, and antibiotics do not work against viruses. Using antibiotics inappropriately, such as for viral infections, can lead to antibiotic resistance and other adverse effects. Therefore, it is important to use antibiotics only when prescribed by a healthcare professional for bacterial infections.
What type of bond bonds one molecule of water with another molecule of water?
- A. Ionic
- B. Covalent
- C. Hydrogen
- D. Molecular
Correct Answer: C
Rationale: Two molecules of water are bonded through hydrogen bonding. This type of bond forms between the slightly positive hydrogen atom in one water molecule and the slightly negative oxygen atom in another water molecule. Hydrogen bonds are weaker than covalent bonds but are essential in various biological processes and properties of water, contributing to its unique characteristics like high surface tension, cohesion, and adhesion.
What are the three types of muscle tissue?
- A. Cardiac, spinal, stomach
- B. Smooth, skeletal, cardiac
- C. Neuron, epithelial, collagen
- D. None of the above
Correct Answer: B
Rationale: The correct answer is B: Smooth, skeletal, cardiac. Muscle tissue in the body is classified into three main types: smooth muscle (found in hollow organs like the digestive tract), skeletal muscle (attached to bones, responsible for voluntary movement), and cardiac muscle (specific to the heart, responsible for its rhythmic contractions). Therefore, option B is the correct answer as it lists the three types of muscle tissue.