Nokea
In the human life cycle, only sperm and eggs have which number of chromosomes?
- A. Diploid
- B. Polyploid
- C. Monoploid
- D. Haploid
Correct Answer: D
Rationale: In humans, sperm and egg cells are haploid, meaning they contain half the number of chromosomes (23) compared to diploid cells (46). This reduction in chromosome number is essential for sexual reproduction, allowing the formation of a diploid zygote upon fertilization. Haploid cells carry only one set of chromosomes, which is necessary for genetic diversity and the fusion of genetic material during fertilization.
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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.
How is the aerodynamic nature of a bird's wing best categorized in biology?
- A. Organisms and their environment
- B. Ontogeny
- C. Structure and function
- D. Heredity
Correct Answer: C
Rationale: The aerodynamic nature of a bird's wing exemplifies the relationship between its structure and its function, showcasing how its form is intricately adapted for its function of flight. This concept of the interdependence of structure and function is a fundamental theme in biology. It emphasizes how the structures of living organisms are precisely designed to carry out specific functions, thereby influencing their survival and success in their respective environments.
In a population of dogs, fur color is controlled by two alleles: black (B) and tan (b). The black allele shows complete dominance. If a dog has a tan fur phenotype, what is its genotype?
- A. BB
- B. Bb
- C. bb
- D. Not enough information
Correct Answer: C
Rationale: If a dog displays a tan fur phenotype, it indicates that the dog possesses two tan alleles, represented by the genotype bb. In this case, the dog cannot have any black alleles (B) since the black allele demonstrates complete dominance over the tan allele. Therefore, the correct genotype for a dog with a tan fur phenotype is bb.
Which set is correctly listed from largest to smallest group?
- A. Genus, order, species, phylum.
- B. Phylum, order, genus, species.
- C. Order, phylum, species, genus.
- D. Species, order, phylum, genus.
Correct Answer: B
Rationale:
Human cells need oxygen for respiration. What system of the body is responsible for transporting an oxygen molecule to different locations throughout the body?
- A. Skeletal.
- B. Lymphatic.
- C. Respiratory.
- D. Circulatory.
Correct Answer: D
Rationale: