Nokea
Based on the information provided, what would be the phenotype if the offspring is Bb?
- A. Black
- B. Black and tan
- C. Tan
- D. Not enough information
Correct Answer: A
Rationale: In genetics, when the offspring is Bb, it represents a heterozygous genotype with 'B' denoting black color. In this scenario, 'black' would be the phenotype displayed by the offspring. The dominant allele 'B' for black color would mask the recessive allele 'b,' resulting in the expression of the black phenotype.
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AIDS is caused by what type of infectious agent?
- A. Protist.
- B. Bacterium.
- C. Insect.
- D. Virus.
Correct Answer: D
Rationale: The correct answer is D: Virus. AIDS is caused by the Human Immunodeficiency Virus (HIV), which attacks the immune system and weakens the body's ability to fight infections. Viruses are unique infectious agents that require a host cell to replicate and cause disease, which is the case with HIV.
A: Protists are eukaryotic organisms like parasites, but they are not known to cause AIDS.
B: Bacteria are prokaryotic organisms that can cause various infections, but they do not cause AIDS.
C: Insects are not infectious agents themselves but can transmit diseases, they do not cause AIDS.
In summary, the correct answer is D because HIV, a virus, specifically causes AIDS by targeting and damaging the immune system.
What is the function of water in photosynthesis?
- A. Combine with carbon dioxide
- B. Absorb light energy
- C. Supply electrons in the light reactions
- D. Transport hydrogen ions in the dark reactions
Correct Answer: C
Rationale: Water plays a crucial role in photosynthesis by supplying electrons in the light reactions of the process. During the light reactions of photosynthesis, water molecules are split, releasing oxygen and providing electrons that are used to drive the production of energy-rich molecules like ATP and NADPH. This electron transfer process is essential for converting light energy into chemical energy, which is then used in the subsequent steps of photosynthesis to produce glucose and other organic compounds.
Which method of glucose conversion generates the most usable and efficient form of ATP within the human body?
- A. Aerobic respiration
- B. Anaerobic respiration
- C. Lactic acidosis
- D. Fermentation conversion
Correct Answer: A
Rationale: Aerobic respiration generates the most ATP (around 36-38 ATP molecules per glucose molecule). It uses oxygen and occurs in the mitochondria, making it the most efficient way for the body to produce energy. In contrast, anaerobic respiration and fermentation produce significantly less ATP and are less efficient processes. Lactic acidosis is a medical condition involving the buildup of lactic acid in the body and is not a method of glucose conversion for energy production.
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.
Which genetic descriptor refers to an organism's actual appearance?
- A. Phenotype.
- B. Homozygote.
- C. Genotype
- D. Karyotype.
Correct Answer: A
Rationale: