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Example Questions
Example Question #7 : Bacterial Physiology
Which of the following is found in prokaryotes and not eukaryotes?
Ribosomes
Plasmids
Mitochondria
Flagella
Plasmids
Plasmids are found only in prokaryotes. In bacteria, they are transferred either via conjugation, transduction, or transformation. Both prokaryotes and eukaryotes contain ribosomes, however the subunits of eukaryotes are smaller (have a lower sedimentation rate). Both can contain flagella, but they differ in complexity and type of motion. Only eukaryotes contain mitochondria, which is the site of the Krebs cycle, beta-oxidation of fatty acids, and electron transport.
Example Question #31 : Bacteria
A bacterium has a generation time of 25 minutes. Starting with a single cell, how many cells are present in 200 minutes?
This question involves the concept of generation time, which is the time it takes one colony to double. Therefore, there will be 2 cells in 25 minutes, 4 cells in 50 minutes, 8 cells in 75 minutes, 16 in 100 minutes, 32 cells in 125 minutes, 64 cells in 150 minutes, 128 cells in 175 minutes, and 256 cells in 200 minutes. Note that it is very rare for a single bacterium to be isolated, thus a bacterial colony grows exponentially over a short period of time. Note that 200 minutes represents 8 generation times. The number of bacteria, when starting with a single cell, can be calculated as where is the number of generation (doubling) times. Here, we have .
Example Question #221 : Nclex
Which sterilization method is best for destroying endospores?
Pasteurization
Refrigeration
Autoclave
Oven
Autoclave
Students should possess the knowledge that the Clostridium genus produces endospores. This fact makes them extremely virulent. Heating alone will not kill the spores. Only heat, accompanied by pressure, will penetrate spores. This method is obtained either by an autoclave or pressure cooker.
Example Question #221 : Nclex
A synthetic protein is created inside a bacterium from an introduced RNA strand. Which method does the bacterium employ to create the desired protein?
Replication
Transcription
Transduction
Translation
Translation
This question requires that the student recognizes that the process illustrated is recombinant DNA (deoxyribonucleic acid) technique. It requires the understanding that the process of producing protein from RNA (ribonucleic acid) is termed translation. Replication is the process by which DNA is synthesized from DNA. Transcription proceeds translation and involves synthesizing RNA transcripts of specific sections of DNA. Transduction is one way bacteria exchange genetic information. Specifically, transduction involves the transfer of bacterial DNA via bacteriophage. Note that this is one way that a group of bacteria can become resistant to antibiotics without ever having been exposed to the antibiotic to which they are resistant.
Example Question #222 : Nclex
Pili allow for the movement of genetic material between sister bacteria by a process known as __________, which allows for the passage of (a) __________?
transduction . . . prophage
conjugation . . . plasmid
translation . . . protein
transformation . . . naked DNA
conjugation . . . plasmid
The question requires the knowledge of pili and that pili are of two types: attachment and conjugation. Conjugation is a way that bacteria become resistant to antibiotics. In this process, a circular piece of deoxyribonucleic acid (DNA) (plasmid) is exchanged through a conjugation pilus. Transformation is genetic alteration caused by direct uptake of naked genetic material from a bacteria's surroundings. A prophage is a bacteriophage that has inserted itself in the genome or plasmid of its host via the lysogenic cycle is latent. Transduction is the movement of genetic material due to bacteriophage that digest host DNA and accidentally package it inside their own capsids. These phage then go on to infect other bacteria, and insert the newly borrowed DNA into the new host cell's genome/plasmids. Translation is the process in which RNA (ribonucleic acid) is converted to protein.
Example Question #33 : Microbiology
A tuberculosis skin test is given to a patient who is severely immunocompromised with a low CD4+ cell count. This test is considered positive if it is greater than __________.
5cm
1cm
5mm
10cm
10mm
5mm
The TB skin test has different thresholds for positive values based on the size of induration. In an HIV-positive individual (low CD4+, immunocompromised), a test is considered positive if it is > 5 mm (not cm). A positive result takes 24 to 48 hours to reveal itself.
Example Question #1 : Identifying Viruses
What is an infectious cause of orchitis?
Chlamydia
Epstein-Barr virus
Measles
Mumps
Mumps
Orchitis due to mumps has decreased significantly due to vaccination, but it is still a significant risk in unvaccinated individuals. Mumps-related orchitis can result in testicular failure later in life. None of the other microbial infections listed have an association with orchitis.
Example Question #31 : Microbiology
Hepatitis C is associated with higher levels of what metabolic disorder?
Fabry disease
Type II diabetes
Wasting syndrome
Gaucher's disease
Type II diabetes
Individuals with hepatitis C have a much higher incidence of development of type II diabetes. This is thought to be due to increased levels of tumor necrosis factor (TNF)-alpha, which leads to insulin resistance. Gaucher's disease is a hereditary disorder of glucosylceramide accumulation that can affect the liver but is not caused by hepatitis C virus. Wasting syndrome is a general term for individuals who experience unintentional weight loss due to a disease such as cancer. Fabry disease is a rare liposomal storage disorder unrelated to any viral infection.
Example Question #2 : Viruses And Other Microorganisms
A child appears with a flat pink rash that first appeared on the trunk. Subsequently, the rash migrated to the rest of the body. Which of the following is the most likely cause?
Smallpox
Rubella
Measles
Chickenpox
Rubella
This question requires the student to distinguish between the rashes that are common in children; specifically those that may be present due to fear of immunizations. Measles begins with Koplik's spot in the mouth. Then the rash first appears on the forehead. Rubella first appears on the trunk, then spreads throughout the body. Chicken pox manifests as fluid-filled vesicles. Smallpox appears as blister-like lesions and this disease has been eradicated for a few decades.
Example Question #2 : Viruses And Other Microorganisms
Which strain of human papillomavirus (HPV) is associated with the most forms of cancer?
18
16
6
11
16
While HPV 18 is associated with a large percentage of cervical dysplasia alongside HPV 16, HPV 16 is the strain associated with the majority of HPV-related anal cancer, cancer of the throat, tongue cancer, vaginal cancer, vulvar cancer, and penile cancer.
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