- What is the main source of energy for living things?
- Does fungi have RNA or DNA?
- Are viruses created?
- Can viruses reproduce on their own?
- Do all living things use energy?
- Do all living things need oxygen?
- What cell does not have DNA?
- Does any living thing not have DNA?
- Is RNA present in virus?
- Which is older bacteria or virus?
- Do viruses need energy?
- Does all bacteria contain RNA?
- What if DNA did not exist?
- Are viruses living?
- Can all living things move?
- What came first RNA or DNA?
- Why doesn’t DNA leave the nucleus?
What is the main source of energy for living things?
The SunThe Sun is the major source of energy for organisms and the ecosystems of which they are a part.
Producers, such as plants and algae, use energy from sunlight to make food energy by combining carbon dioxide and water to form organic matter.
This process begins the flow of energy through almost all food webs..
Does fungi have RNA or DNA?
Fungi are eukaryotes and have a complex cellular organization. As eukaryotes, fungal cells contain a membrane-bound nucleus where the DNA is wrapped around histone proteins. A few types of fungi have structures comparable to bacterial plasmids (loops of DNA).
Are viruses created?
These studies have shown us that viruses do not have a single origin; that is, they did not all arise from one single virus that changed and evolved into all the viruses we know today. Viruses probably have a number of independent origins, almost certainly at different times.
Can viruses reproduce on their own?
How do viruses multiply? Due to their simple structure, viruses cannot move or even reproduce without the help of an unwitting host cell.
Do all living things use energy?
All living organisms need energy to grow and reproduce, maintain their structures, and respond to their environments. Metabolism is the set of life-sustaining chemical processes that enables organisms transform the chemical energy stored in molecules into energy that can be used for cellular processes.
Do all living things need oxygen?
Almost all living things need oxygen. They use this oxygen during the process of creating energy in living cells. … Plants mark the beginning of the oxygen cycle. Plants are able to use the energy of sunlight to convert carbon dioxide and water into carbohydrates and oxygen in a process called photosynthesis.
What cell does not have DNA?
Specifically, mature red blood cells and cornified cells in the skin, hair, and nails contain no nucleus. Mature hair cells do not contain any nuclear DNA.
Does any living thing not have DNA?
All living things that we know of have DNA. One must keep in mind though, that “life” is a somewhat vague term that doesn’t have a single generally agreed-upon definition. This means that some people include e.g. viruses in life, whereas others don’t. Some viruses use DNA, but others use RNA for the same purpose.
Is RNA present in virus?
Most viruses have either RNA or DNA as their genetic material. The nucleic acid may be single- or double-stranded. The entire infectious virus particle, called a virion, consists of the nucleic acid and an outer shell of protein. The simplest viruses contain only enough RNA or DNA to encode four proteins.
Which is older bacteria or virus?
Viruses did not evolve first, they found. Instead, viruses and bacteria both descended from an ancient cellular life form. But while – like humans – bacteria evolved to become more complex, viruses became simpler. Today, viruses are so small and simple, they can’t even replicate on their own.
Do viruses need energy?
Viruses are too small and simple to collect or use their own energy – they just steal it from the cells they infect. Viruses only need energy when they make copies of themselves, and they don’t need any energy at all when they are outside of a cell.
Does all bacteria contain RNA?
bacteria do not have a membrane-bound nucleus, and their genetic material is typically a single circular bacterial chromosome of DNA located in the cytoplasm in an irregularly shaped body called the nucleoid. The nucleoid contains the chromosome with its associated proteins and RNA.
What if DNA did not exist?
Without DNA, cells could not reproduce, which would mean extinction of the species. Normally, the nucleus makes copies of chromosomal DNA, then segments of DNA recombine, and next the chromosomes divide twice, forming four haploid egg or sperm cells.
Are viruses living?
So were they ever alive? Most biologists say no. Viruses are not made out of cells, they can’t keep themselves in a stable state, they don’t grow, and they can’t make their own energy. Even though they definitely replicate and adapt to their environment, viruses are more like androids than real living organisms.
Can all living things move?
All living things move in some way. This may be obvious, such as animals that are able to walk, or less obvious, such as plants that have parts that move to track the movement of the sun.
What came first RNA or DNA?
It now seems certain that RNA was the first molecule of heredity, so it evolved all the essential methods for storing and expressing genetic information before DNA came onto the scene. However, single-stranded RNA is rather unstable and is easily damaged by enzymes.
Why doesn’t DNA leave the nucleus?
Answer and Explanation: DNA cannot leave the nucleus because that would risk it getting damaged. DNA carries the genetic code and all of the information needed for cells and…