You want to conduct an experiment to see if a fertilizer increases the rate of growth of tomato plants. An appropriate control would be
growing corn plants with various amounts of fertilizer
growing tomato plants with various amounts of fertilizer
growing corn plants without fertilizer
growing tomato plants without fertilizer
The Correct Answer is D
A. growing corn plants with various amounts of fertilizer: Using corn plants introduces a different species, which makes results irrelevant to the effect of fertilizer on tomato plants.
B. growing tomato plants with various amounts of fertilizer: This is part of the experimental group rather than a control, as it tests different fertilizer levels rather than providing a baseline for comparison.
C. growing corn plants without fertilizer: Corn plants are not suitable because the research question focuses on tomato plants. A valid control must match the species being studied.
D. growing tomato plants without fertilizer: This is the correct control, as it provides a baseline growth rate for tomato plants without fertilizer, allowing meaningful comparison with fertilized groups.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. shape: Viruses are classified by their capsid shape, which may be helical, icosahedral, or complex. This structural feature is a key criterion in viral taxonomy.
B. type of nucleic acid: Viral classification depends on whether the genome is DNA or RNA, single-stranded or double-stranded, and positive- or negative-sense.
C. size: The physical size of viruses, ranging from about 20 nm to 300 nm, is one of the factors used in classification.
D. ribosome size: Viruses do not contain ribosomes, as they rely on the host cell’s protein synthesis machinery. Therefore, ribosome size is not a characteristic used in viral classification.
Correct Answer is C
Explanation
A. Staphylococcus: Staphylococcus species are Gram-positive cocci that possess thick peptidoglycan cell walls, giving them rigidity and shape. They do not naturally lack a cell wall.
B. Bacillus: Bacillus species are Gram-positive, rod-shaped bacteria with strong cell walls. They are also capable of forming endospores but are not wall-deficient.
C. Mycoplasma: Mycoplasma species naturally lack a cell wall, relying on sterols in their cell membrane for structural support. This absence makes them pleomorphic and resistant to antibiotics like penicillin that target cell wall synthesis.
D. Clostridium: Clostridium species are Gram-positive rods with thick cell walls and the ability to produce endospores. They do not naturally exist without a cell wall.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today