Table of Contents
- 1 What characteristics of some spores allows them to survive in unfavorable conditions?
- 2 What is a cell with a hard protective coat around it?
- 3 What might happen during mitosis that could cause a cell to become cancerous?
- 4 What contains the information needed for cell functions?
- 5 Is Oogenesis a meiosis?
- 6 What are the main characteristics of bacterial spores?
- 7 Which is the outermost layer of the spore?
- 8 How are spores organized in the cytoplasm?
What characteristics of some spores allows them to survive in unfavorable conditions?
Several features in particular help to make endospores resistant to environmental stress. They have a low water content, unusual proteins and a tough spore coat that is not present in the mature bacterial cells.
What is a cell with a hard protective coat around it?
Life Science Ch9-A & B complete
|Mitosis||The duplicationof the mother cell’s genes|
|Runners||A stem formed by a plant as a means of asexual reproduction|
|Plantlet||A tiny plant that grows on the stem of a parent plant|
|Spore||A cell with a hard protective coat around it|
Do chromosomes Decondense in telophase 1?
Telophase I and Cytokinesis In some organisms, the chromosomes decondense and nuclear envelopes form around the chromatids in telophase I. The cells are haploid because at each pole, there is just one of each pair of the homologous chromosomes. Therefore, only one full set of the chromosomes is present.
What might happen during mitosis that could cause a cell to become cancerous?
Mutations in genes can cause cancer by accelerating cell division rates or inhibiting normal controls on the system, such as cell cycle arrest or programmed cell death. As a mass of cancerous cells grows, it can develop into a tumor.
What contains the information needed for cell functions?
DNA is the molecule that contains all of the information required to build and maintain the cell; RNA has several roles associated with expression of the information stored in DNA.
Do chromosomes replicate in meiosis?
In meiosis, the chromosome or chromosomes duplicate (during interphase) and homologous chromosomes exchange genetic information (chromosomal crossover) during the first division, called meiosis I. The daughter cells divide again in meiosis II, splitting up sister chromatids to form haploid gametes.
Is Oogenesis a meiosis?
In females, the process of meiosis is called oogenesis, since it produces oocytes and ultimately yields mature ova(eggs). The two-stage process of meiosis begins with meiosis I, also known as reduction division since it reduces the diploid number of chromosomes in each daughter cell by half.
What are the main characteristics of bacterial spores?
– These structures are resistant to heat, pressure, radiation and strong acids and bases. In general, they are able to withstand extreme conditions that very few organisms can cope with. – The spores are found is a state of semi-hydration. Only 10% of the water from the stem cell is passed to the spore during its formation.
What are the characteristics of Bacillus anthracis spores?
These are extremely resistant to unfavorable external conditions, such as high and low temperatures, droughts, radiation, among others. They are also resistant to chemicals created by humans, such as antibiotics and disinfectants. Bacillus anthracis spores, which causes anthrax disease.
Which is the outermost layer of the spore?
A protective layer, called cortical cortex, is formed. This layer is made up of proteins. In this stage, the exosporium is also constituted, which is the outermost layer of the spore.
How are spores organized in the cytoplasm?
The cytoplasm is compacted and the elements are organized inside the spore, with which it matures. The spore is released to the outside. Studies of spore longevity indicate that spores may remain dormant for a decade, or even many more years.