The term heterotroph refers to an organism that
uses C02, for its carbon source.
must obtain organic compounds for its carbon needs.
gets energy by oxidizing inorganic compounds.
gets energy from sunlight.
does not need a carbon source.
The Correct Answer is B
A. uses CO₂ for its carbon source: Organisms that use carbon dioxide as their carbon source are called autotrophs, not heterotrophs. Autotrophs can synthesize organic compounds from inorganic carbon, whereas heterotrophs rely on preformed organic molecules.
B. must obtain organic compounds for its carbon needs: Heterotrophs cannot fix carbon dioxide into organic compounds, so they rely on consuming organic molecules such as carbohydrates, lipids, or proteins from other organisms. This dependency on external organic carbon distinguishes heterotrophs from autotrophs.
C. gets energy by oxidizing inorganic compounds: Organisms that derive energy from the oxidation of inorganic substances are chemolithotrophs. While some heterotrophs may also utilize chemical energy, the defining feature of a heterotroph is its requirement for organic carbon, not the energy source.
D. gets energy from sunlight: Organisms that capture energy from sunlight are phototrophs. While some phototrophs are autotrophs, heterotrophs rely on organic compounds for carbon and may use chemical energy rather than sunlight.
E. does not need a carbon source: All organisms require a carbon source to build cellular structures and macromolecules. Heterotrophs, in particular, must obtain organic carbon from their environment to survive and grow.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Obligate aerobe: An obligate aerobe requires oxygen for growth because it relies on aerobic respiration to produce ATP. Without oxygen, these bacteria cannot generate sufficient energy and will fail to survive. Examples include Mycobacterium tuberculosis and Pseudomonas aeruginosa.
B. Obligate anaerobe: An obligate anaerobe cannot tolerate oxygen and may be killed or inhibited by its presence. These bacteria rely on fermentation or anaerobic respiration for energy and are typically found in oxygen-free environments such as deep tissues or the gastrointestinal tract.
C. Aerotolerant organism: Aerotolerant organisms do not require oxygen for growth but can survive in its presence. They rely on fermentation exclusively and are indifferent to oxygen, unlike obligate aerobes which must have it for survival.
Correct Answer is B
Explanation
A. nucleotide: A nucleotide is the basic structural unit of DNA and RNA, consisting of a sugar, phosphate group, and nitrogenous base. While nucleotides make up the DNA sequence, a group of three bases does not code for a single nucleotide but rather for an amino acid.
B. amino acid: A codon, composed of three consecutive nucleotide bases in DNA or RNA, specifies a single amino acid during protein synthesis. For example, the DNA triplet ATG codes for the amino acid methionine. This triplet code is universal and ensures accurate translation from genetic information to functional proteins.
C. purine: Purines, such as adenine and guanine, are types of nitrogenous bases. They are part of nucleotides, but a triplet of bases does not directly correspond to a single purine; instead, codons dictate amino acids.
D. protein: Proteins are composed of long chains of amino acids. While codons ultimately determine the sequence of amino acids that form a protein, each codon specifies only one amino acid, not an entire protein.
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
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.