Earthquake- natural disaster
Answer:
Water
Oxygen
Carbon dioxide
Lipids
Explanation:
The plasma membrane is a lipid bilayer with a hydrophobic core made of nonpolar tails of phospholipids. The plasma membrane allows only uncharged, small and hydrophobic substances to pass through it. Charged particles such as ions, polar molecules such as sucrose can not cross the hydrophobic core of the plasma membrane.
Oxygen and carbon dioxide gases have small sizes and can diffuse through the spaces between the tails of phospholipids of lipid bilayer of the plasma membrane without any transport proteins. Lipids are hydrophobic and therefore, do not need any transport proteins to cross the lipid bilayer. The small water molecules are also free to move through the membrane.
Answer:
Cilia and flagella arise from the centrioles
Explanation:
Some cells have projections made up of microtubules and covered by extensions of the plasma membrane.
These projections can be cilia or flagella.
Centrioles are also made of microtubule from which the cilia and flagella arise. It also takes part during cell division
Basal bodies are protein structures found at the base of cilia and flagella. It functions as a site starting point for the growth of microtubule for the cilia and flagella
Answer:
a) Mitotic metaphase
8 picograms
b) a primary oocyte (metaphase)
8 pecograms
c) a secondary oocyte (metaphae)
4 pecograms
d) a first polar body (metaphase)
4 pecograms
Explanation:
a) In mitotic phase the chromosome numbers remains same as 8 because in this phase duplicated chromosomes align in center and separate to other poles. Therefore the amount of DNA will be 8 pecograms.
b) after the mitotic meta phase the cells divide into daughter cell with equal proportion of DNA which means each cell have 8 chromosomes. therefore they both contain 8 pecograms of DNA. The new daughter cells called as primary oocytes.
c) These primary oocytes (8 chromosomes) divides into two secondary oocyte each contain 4 chromosomes which means each cell have 4 pecograms of DNA.
d) Duplication of chromosomes occur in secondary oocyte and cell divides into polar body (4 chromosomes) and ovum (4 chromosomes). Therefore first polar body have 4 pecograms of DNA in it.
See the attachment for clarification.
Answer:
All responses are correct
Explanation:
1- This process of chemical extraction produces release of toxins that are toxic to other life forms
2- Sponges are critical organisms in the nutrient cycles
3- Sponges provide habitat for other species (fish, crustaceans, etc)
4- Sponges have the ability to regenerate when they are separated into pieces