i need help with my biology homework....?

Question

okay
1.what are the heirarchy of life from smallest to largest?
2.In salt water what is the solvent and what is the solute?
3.What is the difference between an ionic bond and a covalent bond?
4.what are the functions of- a. nucleus b.mitochondria c. cell membrane d. endoplasmic reticulum
5.what is diffusion? does this require energy?
6.what is the difference between ADP and ATP?
7.where does photosynthesis take place in a cell?
8.what happens when oxygen is not present in a cell?
9.what is the relationship between photosynthesis and cell respiration?
10.What organelle would be expected to be more plentiful in liver cells than in muscle cells?-
a.mitochondria
b.nucleus
c.golgi aparatus
d.plastid



please help me, i dont have a book or anything.

oh yeah
and what does a catalyst lower??

Answer 1

here's some of them:

nucleus - The nucleus regulates all cell activity. It does this by controlling the enzymes present.

mito - The main function of the mitochondrion is the production of energy, in the form of adenosine triphosphate (ATP). The cell uses this energy to perform the specific work necessary for cell survival and function.

endo - The endoplasmic reticulum or ER is an organelle found in all eukaryotic cells that is an interconnected network of tubules, vesicles and cisternae that is responsible for several specialized functions: Protein translation, folding, and transport of proteins to be used in the cell membrane (e.g., transmembrane receptors and other integral membrane proteins), or to be secreted (exocytosed) from the cell (e.g., digestive enzymes); sequestration of calcium; and production and storage of glycogen, steroids, and other macromolecules.

cell membrane - the cell membrane forms a barrier between the inside of the cell and the outside,
so that the chemical environments on the two sides can be different. The cell controls
those differences so as to optimize the workings of the chemical machinery inside the
cytoplasm. The cell also causes brief changes in the internal environment by moving
stuff across the membrane in a controlled way.

where does photosynthesis take place in a cell? - Photosynthesis takes place in the chloroplasts.


what is the relationship between photosynthesis and cell respiration? - look at site : http://sciences.aum.edu/bi/BI4523/student/cardwell/phvre.html


Covalent bonding is a description of chemical bonding that is characterized by the sharing of pairs of electrons between atoms.

Ionic bonds are a type of chemical bond based on electrostatic forces between two oppositely-charged ions. In ionic bond formation, a metal donates an electron, due to a low electronegativity to form a positive ion or cation.

Answer 2

ill help with the ones that werent answered.
1. smallest-molecules, cells, organelles, tissues, organs/organ systems, organisms, populations, communities, ecosystems, the biosphere=largest

2. water is the solvent. salt=solute

5. diffusion is the process of solutes moving across a semi-permeable membrane. It does not require energy because they move down their concentration gradients which is a spontaneous process.

6. ADP + P ---> ATP
ADP is the inactive form of ATP. Energy is needed to add another phosphate to ADP to form ATP, however, more energy is released by the breakdown of ATP, which is why formation of ATP is endothermic, but still favorable to the cell.

6. photosynthesis takes place in the chloroplasts.

8. When there is no oxygen, the cell cannot complete the cellular respiration cycle so the only energy a cell can obtain is through glycolysis, which does not require oxygen, but can only produce 2 ATP. fermentation is a type of anaerobic respiration. Anaerobic respiration leads to the production of 2 products either ethanol or lactic acid. Humans produce lactic acid when our muscle cells lack oxygen during exercise.

9. they are both ways that organism make energy. Photosynthesis used in plants, and cellular respiration in all others.

10. golgi apparatus

Answer 3

2.Water is the solvent, water is the solute. A solute is dissolved in a solvent.
3.Ionic bonds electrons are exchanged, covalent electrons are shared.
4.Nucleus houses DNA,Mitochondria- powerhouse, ATP is made, Cell membrane- semi permeable membranes , they are the border patrol for the cell. Maintain an osmotic balance, and allow things to pass in or out. Endoplasmic reticulum, proteins are modified
I will come back and answer more later, my baby is up

Answer 4

1.cellular oragnisms to complex living oragnisms
2.salt is the solute and water the solvent
3.ionic is when the element has lost or gained and electron to form a bond, occurs between metalsand nonmetals, covlent is when electrons are shared to form a bond, between two non metals
4.a.nucleus conrols the cell, mitochodria is the power source, cellmembrane is the selectively permeable boundary of cell, endoplasmic recticulum makes protein and lipid connections
5.diffusion is the movement of particles from a high conc to a low conc along a gradient
6.adp ismade from atp when oxidised in the process of respiration
7.p takes place in the chloroplasts
8.the cell respires anaerobically
9.p products are the reactants of r and v v
10.mitochondria

Answer 5

-----You should get a book, fast. To a certain extent, the answers will vary according to what book your teacher is using. The time spent in doing all that typing could have been spent learning the material; you are asking someone to help you cut your own throat. ---Jim, a biology major

Answer 6

what!