The DNA of prokaryotes is located in the:
Nucleus
Nucleoid region
Mitochondria
Ribosome
The Correct Answer is B
A. Nucleus: Prokaryotic cells do not possess a true nucleus. A nucleus is a membrane-bound organelle that encloses DNA in eukaryotic cells, separating transcription from cytoplasmic processes. Because prokaryotes lack membrane-bound organelles, their genetic material is not enclosed within a nuclear membrane.
B. Nucleoid region: In prokaryotic cells, DNA is concentrated in an irregularly shaped area of the cytoplasm called the nucleoid. This region contains the bacterial chromosome, which is typically a single circular DNA molecule. The nucleoid is organized by DNA-binding proteins that help compact and regulate the genetic material for replication and transcription.
C. Mitochondria: Mitochondria are membrane-bound organelles responsible for aerobic energy production in eukaryotic cells. They contain their own mitochondrial DNA, but prokaryotic cells do not have mitochondria. Instead, energy generation in bacteria occurs across the plasma membrane through processes such as oxidative phosphorylation.
D. Ribosome: Ribosomes are cellular structures responsible for protein synthesis by translating messenger RNA into polypeptide chains. In prokaryotes, ribosomes are 70S and are found freely in the cytoplasm. They do not store or contain the cell’s DNA and therefore are not the location of genetic material.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. antisepsis: Antisepsis refers to the application of chemical agents, known as antiseptics, directly to living tissues to destroy or inhibit the growth of vegetative pathogens. Common antiseptics include alcohols, iodine preparations, chlorhexidine, and hydrogen peroxide. These agents are widely used before injections, surgical procedures, and wound care to reduce microbial load and prevent infection.
B. sanitization: Sanitization involves reducing the number of microorganisms on inanimate objects to levels considered safe according to public health standards. This process is commonly used in food preparation areas, restaurants, and public facilities. It does not necessarily destroy all vegetative pathogens and is not intended for use on living tissues.
C. sterilization: Sterilization is the complete elimination of all forms of microbial life, including bacterial spores, viruses, fungi, and vegetative cells. Methods such as autoclaving, dry heat, radiation, and certain chemical sterilants are used for medical instruments and laboratory materials. Sterilization methods are extremely harsh and are not applied to living tissues.
D. disinfection: Disinfection involves the use of chemical or physical agents to destroy vegetative pathogens on inanimate objects such as medical equipment, countertops, and hospital surfaces. While effective against many microorganisms, disinfectants are typically too toxic or irritating to be used safely on living tissues.
E. degermation: Degermation refers to the mechanical removal of microorganisms from a limited area, usually through physical actions such as scrubbing or washing. While it reduces microbial numbers, it primarily involves mechanical removal rather than the direct chemical destruction of pathogens.
Correct Answer is A
Explanation
Upon inoculation into a new culture, bacteria do not immediately enter exponential growth. Initially, they enter the lag phase, a period of metabolic adjustment where cells synthesize necessary enzymes, repair cellular components, and adapt to the new environment. During this phase, there is little to no increase in cell number, but metabolic activity is high. Only after this adaptation period do the bacteria enter the logarithmic (exponential) phase, where rapid cell division occurs. The length of the lag phase depends on factors such as the physiological state of the inoculum, nutrient availability, and environmental conditions.
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