Nokea
What is the typical result of mitosis in humans?
- A. two diploid cells
- B. two haploid cells
- C. four diploid cells
- D. four haploid cells
Correct Answer: A
Rationale: During mitosis, a cell divides to produce two identical daughter cells that are genetically identical to the parent cell. These daughter cells are diploid, meaning they contain the full set of chromosomes. Therefore, the typical result of mitosis in humans is the formation of two diploid cells (Choice A). Choices B, C, and D are incorrect as mitosis results in the production of diploid cells, not haploid cells, and typically, it results in two daughter cells, not four.
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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:
Phenotype refers to the....................of an individual.
- A. Genetic makeup
- B. Actual physical appearance
- C. Recessive alleles
- D. None of the above
Correct Answer: B
Rationale: Phenotype refers to the observable characteristics or traits of an individual, such as physical appearance, behavior, and other observable features. While the genotype represents the genetic makeup of an individual, the phenotype is what is actually expressed or seen. Recessive alleles are specific forms of genes that can be present in the genotype but may not always be expressed in the phenotype.
A child is sick. They have a body temperature that exceeds 37Å—C. The body senses this and begins to sweat in order to lower the temperature. What is this an example of?
- A. Positive feedback loop
- B. Negative feedback loop
- C. Both
- D. None of the above
Correct Answer: B
Rationale: This scenario describes a negative feedback loop. In negative feedback, the body's response works to reverse the initial stimulus, in this case, sweating to lower the elevated body temperature. This mechanism helps maintain homeostasis by regulating the body's temperature back to the normal range.
What part of a light microscope is used to hold the slide in place?
- A. Stage clips
- B. Rack stop.
- C. Base.
- D. Arm.
Correct Answer: A
Rationale:
What term describes the process of producing the RNA strand from a DNA template?
- A. Metabolism.
- B. Transcription.
- C. Synthesis.
- D. Replication.
Correct Answer: B
Rationale: The correct answer is B: Transcription. Transcription is the process where RNA is synthesized from a DNA template by RNA polymerase. During transcription, the DNA double helix unwinds, and one strand is used as a template to create a complementary RNA molecule. This process occurs in the cell nucleus and is essential for gene expression.
Choice A, Metabolism, refers to the chemical reactions that occur in living organisms to maintain life and is not directly related to RNA synthesis. Choice C, Synthesis, is a general term that does not specifically describe the process of RNA production from a DNA template. Choice D, Replication, is the process of copying DNA to create an identical DNA molecule, not RNA synthesis. Therefore, the correct term for producing an RNA strand from a DNA template is Transcription.