Introduction to Biology (C190)
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Free Introduction to Biology (C190) Questions
A red flower is crossed with a white flower, and the result is a pink flower. What is this an example of?
- Incomplete dominance
- Codominance
- Complete dominance
- Bi-dominance
Explanation
Explanation
Correct answer: (A) Incomplete dominance
Incomplete dominance occurs when neither allele is completely dominant over the other, resulting in a heterozygous phenotype that is an intermediate blend of the two parental traits. In this case, red and white flower alleles combine to produce pink flowers, showing a blended phenotype. Option B is incorrect because codominance involves both alleles being fully expressed simultaneously (e.g., both traits appear side by side rather than blending). Option C is incorrect because complete dominance would result in only one parental trait appearing (red or white, not pink). Option D is incorrect because “bi-dominance” is not a standard genetic inheritance pattern in Mendelian genetics.
During cellular respiration, organic molecules (e.g., glucose) and oxygen are consumed, and carbon dioxide (CO₂) and ATP are produced. What is happening to the energy in this system?
- Energy is being transformed from glucose into ATP for immediate use in the body.
- Energy is being transformed from glucose into ATP for long-term storage in the body.
- Energy is being transformed from glucose into CO₂ for immediate use in the body.
- Energy is being transformed from glucose into CO₂ for long-term storage in the body.
Explanation
Explanation
Correct answer: (A) Energy is being transformed from glucose into ATP for immediate use in the body
Cellular respiration is a metabolic process in which chemical energy stored in glucose is converted into adenosine triphosphate (ATP), the cell’s primary energy currency used for immediate cellular work such as active transport, biosynthesis, and muscle contraction. Carbon dioxide is produced as a waste product during the breakdown of glucose and does not store usable energy. Option B is incorrect because ATP is not a long-term energy storage molecule; long-term storage is typically handled by lipids and glycogen. Option C is incorrect because CO₂ is a byproduct of metabolism and does not serve as an energy carrier. Option D is incorrect because CO₂ does not function in energy storage, and energy is not stored in it.
Which of the following best reflects the concept of evolution?
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Evolution is a process of biological change in which species accumulate differences from their ancestors as they adapt to different environments over time.
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Evolution is the process of change over an organism's lifetime.
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Evolution is the process that always results in the extinction of species.
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Individual organisms adapt to their surroundings, and this is called evolution.
Explanation
Correct Answer
A. Evolution is a process of biological change in which species accumulate differences from their ancestors as they adapt to different environments over time.
Explanation
Evolution is the process of gradual biological change in species over generations. It involves the accumulation of genetic differences that allow organisms to adapt to their environments, ultimately resulting in new species. This process can occur due to various mechanisms such as natural selection, genetic drift, and gene flow. Over time, these adaptations can result in significant evolutionary changes that better equip species for survival in their environments.
Why other options are wrong
B. Evolution is the process of change over an organism's lifetime.
This is incorrect because evolution refers to changes in populations over multiple generations, not changes that occur within an individual organism during its lifetime. The idea of change over an organism’s lifetime pertains more to development or learning rather than evolutionary change.
C. Evolution is the process that always results in the extinction of species.
This is incorrect because evolution does not always lead to extinction. While some species do go extinct over time due to evolutionary pressures, others adapt and evolve into new forms. Evolution is about diversification and adaptation, not necessarily extinction.
D. Individual organisms adapt to their surroundings, and this is called evolution.
This is incorrect because evolution occurs at the population level, not within an individual organism’s lifetime. An individual can adapt through processes like acclimatization, but evolution refers to genetic changes that occur in populations over generations.
What is the primary focus of biochemistry in the context of biological sciences?
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The study of ecosystems and their interactions
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The examination of chemical processes in living organisms
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The classification of organisms based on their characteristics
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The analysis of physical structures of cells
Explanation
Correct Answer
B. The examination of chemical processes in living organisms
Explanation
Biochemistry is the branch of biology that focuses on understanding the chemical processes that occur within living organisms. It involves the study of the molecular mechanisms underlying cellular processes, such as metabolism, enzyme function, and gene expression. This field bridges biology and chemistry by exploring how molecular structures and interactions facilitate life’s functions.
Why other options are wrong
A. The study of ecosystems and their interactions
This is incorrect because the study of ecosystems and their interactions falls under the field of ecology, not biochemistry. Ecology deals with the relationships between organisms and their environment.
C. The classification of organisms based on their characteristics
This is incorrect because classification of organisms is part of taxonomy, which is distinct from biochemistry. Taxonomy is concerned with organizing organisms into categories based on shared characteristics.
D. The analysis of physical structures of cells
This is incorrect because studying physical structures of cells is more aligned with cell biology or cytology, rather than biochemistry, which focuses on chemical processes.
A gene contains the sequence CGGCATACGGTACT that results in the amino acid sequence arg-ile-arg-tyr. A mutation in this gene removes the first G in the strand. What is true of this mutation's effect on the phenotype?
- It will not affect the phenotype because the protein will be identical to the original protein.
- It will affect the phenotype because all the amino acids past this point will be different from the original protein.
- It will not affect the phenotype because only the first amino acid is different from the original protein.
- It will affect the phenotype because although most of the protein will be identical, the first amino acid will be different.
Explanation
Explanation
Correct answer: (B) It will affect the phenotype because all the amino acids past this point will be different from the original protein.
The removal of a single nucleotide from a coding sequence causes a frameshift mutation, which shifts the reading frame of codons during translation. Because codons are read in triplets, deleting the first G alters every subsequent codon, changing the entire downstream amino acid sequence. This typically produces a nonfunctional protein and therefore affects the phenotype. Option A is incorrect because the protein sequence will not remain identical after a frameshift mutation. Option C is incorrect because the mutation does not affect only the first amino acid; it alters all downstream amino acids. Option D is incorrect because frameshift mutations do not preserve most of the protein sequence, and the effect is not limited to a single amino acid change.
What is the name of the process that moves information from RNA to protein?
- Inscription
- Transcription
- Translation
- Subversion
Explanation
Explanation
Correct answer: (C) Translation
Translation is the process in protein synthesis where the genetic information carried by messenger RNA (mRNA) is decoded by ribosomes to assemble amino acids into a polypeptide (protein). This occurs in the cytoplasm and involves transfer RNA (tRNA) matching codons to the correct amino acids. Option A is incorrect because “inscription” is not a biological process in gene expression. Option B is incorrect because transcription is the process of copying DNA into RNA, not RNA into protein. Option D is incorrect because “subversion” is not a biological term related to gene expression or protein synthesis.
The common steps that biologists and other scientists use to gather information and answer questions are collectively known as __________.
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Scientific methods
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Theme of biology
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Scientific biology
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Theories
Explanation
Correct Answer
A. Scientific methods
Explanation
The scientific method is a systematic approach used by biologists and other scientists to gather information, make observations, form hypotheses, conduct experiments, and analyze results. This method ensures that scientific investigations are objective, reproducible, and based on evidence. The scientific method is central to the process of scientific inquiry and allows scientists to answer questions in a structured and logical manner.
Why other options are wrong
B. Theme of biology
This is incorrect because the theme of biology refers to overarching concepts or principles in biology, such as evolution, energy transfer, or cellular structure. It does not specifically refer to the systematic process used by scientists to gather information and answer questions.
C. Scientific biology
This is incorrect because scientific biology is not a term used to describe the methodology used by scientists. The proper term for the process of gathering information and answering questions is the scientific method.
D. Theories
This is incorrect because theories are broad explanations or models based on a large body of evidence that explain phenomena in the natural world. Theories are developed through the scientific method, but they are not the method itself.
What is the definition of biology?
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The study of living organisms and their interactions
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The study of rocks
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The study of computer programming
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The study of ancient civilizations
Explanation
Correct Answer
A. The study of living organisms and their interactions
Explanation
Biology is the branch of science that focuses on the study of living organisms, their structures, functions, growth, evolution, and interactions with their environments. It covers various subfields, including genetics, ecology, and physiology. Understanding biology is essential for medical advancements, environmental conservation, and the study of life processes.
Why other options are wrong
B. The study of rocks.
This is incorrect because the study of rocks and Earth's physical structure falls under geology, not biology. Geologists examine minerals, rock formations, and Earth's history, whereas biologists focus on living organisms.
C. The study of computer programming.
This is incorrect because computer programming is part of computer science, which deals with coding, algorithms, and software development. Biology, in contrast, involves the study of natural life forms and their behaviors.
D. The study of ancient civilizations.
This is incorrect because the study of ancient civilizations falls under archaeology and history. These fields explore human societies, artifacts, and past cultures, while biology focuses on life sciences.
A pond constitutes which ecological level?
- Ecosystem
- Population
- Biome
- Community
Explanation
Explanation
Correct answer: (A) Ecosystem
An ecosystem includes both the living (biotic) organisms and the non-living (abiotic) components of an environment interacting as a functional unit. A pond contains organisms such as fish, plants, and microorganisms (biotic factors), as well as water, sunlight, dissolved gases, and minerals (abiotic factors), making it an ecosystem. Option B is incorrect because a population refers to all individuals of a single species in an area, not multiple interacting species and abiotic factors. Option C is incorrect because a biome is a large-scale regional classification of ecosystems (e.g., desert, tundra), not a single pond. Option D is incorrect because a community includes only the interacting populations of different species, excluding abiotic components.
Which stage of cellular respiration produces pyruvate?
- Krebs cycle
- Electron transport chain
- Glycolysis
- Calvin cycle
Explanation
Explanation
Correct answer: (C) Glycolysis
Glycolysis is the first stage of cellular respiration in which one molecule of glucose is broken down in the cytoplasm into two molecules of pyruvate, producing a small amount of ATP and NADH in the process. Option A is incorrect because the Krebs cycle occurs after pyruvate is converted into acetyl-CoA and does not produce pyruvate. Option B is incorrect because the electron transport chain uses electrons from NADH and FADH₂ to generate ATP and does not produce pyruvate. Option D is incorrect because the Calvin cycle is part of photosynthesis, not cellular respiration, and is unrelated to pyruvate production.
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