A) Viruses are not alive because they lack some of the key characteristics of living organisms, such as a cytoplasm of organelles. They cannot carry out cellular functions such as metabolism and homeostasis.
How can prokaryotes introduce variation in their populations quizlet?
Genetic diversity in prokaryotes also can arise from recombination of the DNA from two different cells ( Via transformation, transduction or conjugation) By transferring advantageous alleles, such as ones for antibiotic resistance, genetic recombination can promote adaptive evolution in prokaryotic populations.
Which statement is true about viruses?
The correct answer is B. Viruses do not eat food, but they live inside the cells of their hosts.
Which statement best explains why viruses are considered to be nonliving?
Why are viruses considered to be nonliving organisms? They do not have genetic information.
What process will increase genetic diversity in both bacteria and eukaryotes?
In the absence of sexual reproduction, the transfer of DNA between organisms independent of sexual reproduction via lateral gene transfer (LGT) enables bacteria to increase genetic diversity and therefore potentially increase evolutionary fitness.
How prokaryotes though small can be considered giants in their collective impact on Earth and its life?
Although prokaryotes are small, their large numbers and metabolic abilities enable them to play key roles in ecosystems by decomposing wastes, recycling chemicals, and affecting the concentrations of nutrients available to other organisms.
How do the free living bacteria gain diversity quizlet?
Rapid reproduction (short generation times), mutation and genetic recombination(transformation, transduction and conjugation).
Which best describes a virus?
virus. Viruses are microscopic biological agents that invade living hosts and infect their bodies by reproducing within their cell tissue. Viruses are tiny infectious agents that rely on living cells to multiply. They may use an animal, plant, or bacteria host to survive and reproduce.
Which of these best describes a virus?
Which of these best describes a virus? a protein capsid and genetic material, in the form of either RNA or DNA.
Which of the following statement is not true of viruses?
Viruses can not synthesize their food through photosynthesis because they do not contain chlorophyll as they are non- living outside the host’s body.
Why viruses are said to be on the borderline of the living and the non living?
Viruses are considered on the borderline of living and non-living because they show both the characteristics of a living and a non-living. They have the ability to reproduce when inside the host body.
Which two statements are characteristics of a virus?
A virus typically requires end-user activation. A virus replicates itself by independently exploiting vulnerabilities in networks. A virus can be dormant and then activate at a specific time or date.
What do all viruses have in common?
Viruses have several common characteristics: they are small, have DNA or RNA genomes, and are obligate intracellular parasites. The virus capsid functions to protect the nucleic acid from the environment, and some viruses surround their capsid with a membrane envelope.
How does horizontal gene transfer contribute to antibiotic resistance?
Horizontal gene transfer contributes to the spread of antibiotic resistance through the exchange of genetic material across genera, which increases the potential for a harmful, antibiotic resistant bacteria to develop.
How can prokaryotic cells achieve genetic recombination?
However, bacteria have found ways to increase their genetic diversity through three recombination techniques: transduction, transformation and conjugation.
What is the difference between the recombination that occurs in prokaryotic and eukaryotic cells?
Genetic recombination can be observed in both prokaryotic and eukaryotic cells. In eukaryotic cells, genetic recombination occurs during the crossing over event of meiosis, when homologous chromosomes exchange genetic material. In prokaryotes, genetic recombination occurs through the unilateral transfer of DNA.
How can a prokaryotic cell survive without organelles?
Bacteria are prokaryotic cells and do not possess mitochondria or any other organelles. They produce ATP on their surface cell membrane.
How do prokaryotic cells carry out these organelles associated functions despite lacking them?
Since there are no organelles to be transported in prokaryotic cells, such a function is unnecessary. Like the eukaryote cell, the prokaryote cell is filled with cytosol. The prokaryote cytosol is filled with enzymes, which carry out respiratory processes reserved in eukaryotes for the mitochondria.
What structures are found only in eukaryotic cells only in prokaryotic cells?
- All cells have a plasma membrane, ribosomes, cytoplasm, and DNA.
- Prokaryotic cells lack a nucleus and membrane-bound structures.
- Eukaryotic cells have a nucleus and membrane-bound structures called organelles.
Does alcohol rinse remove crystal violet?
Rinse sample/slide with acetone or alcohol for ~3 seconds and rinse with a gentle stream of water. The alcohol will decolorize the sample if it is Gram negative, removing the crystal violet. However, if the alcohol remains on the sample for too long, it may also decolorize Gram positive cells.
How would you design an enrichment culture capable of isolating benzene metabolizing species?
How would you design an enrichment culture capable of isolating benzene-metabolizing species? Sample water or soil polluted with benzene-containing compounds. Put samples from these environments in culture tubes where benzene is the only source of carbon. Monitor the cultures and study the cells that grow efficiently.
What roles do diet and the microbial community in the intestines play in obesity?
A high-fat diet is more likely to cause obesity than a high-sugar diet. A relative abundance of Bacteriodetes less than 25% results in obesity. A microbial community dominated by Firmicutes is associated with increased body fat. A high-fat, high-sugar diet alters the composition of the microbial community.
What is a virus simple definition?
Definition. 00:00. … A virus is an infectious microbe consisting of a segment of nucleic acid (either DNA or RNA) surrounded by a protein coat. A virus cannot replicate alone; instead, it must infect cells and use components of the host cell to make copies of itself.
What is the biggest difference between bacteria and viruses?
On a biological level, the main difference is that bacteria are free-living cells that can live inside or outside a body, while viruses are a non-living collection of molecules that need a host to survive.
Which term best describes viruses quizlet?
which term best describes viruses. miniscule. what do viruses have in common with your body cells. contain DNA or RNA. What is the difference between DNA and RNA.