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jek_recluse [69]
3 years ago
14

What is the difference between an element and a molecule??

Biology
1 answer:
tino4ka555 [31]3 years ago
4 0
A molecule is made of more than one atom of differing elements that can be simplified while an element cannot be simplified because it is only one atom of one type of element.
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What organelles are membrane bound?
VikaD [51]
As you talk in animals
nucleus/ plasma membrane / mitochondria
if you talk in plants
nucleus / the cell / plastid / mitochondria
4 0
3 years ago
Why does the sodium potassium pump require ATP?
SpyIntel [72]

Answer:

The sodium–potassium pump is found in many cell (plasma) membranes. Powered by ATP, the pump moves sodium and potassium ions in opposite directions, each against its concentration gradient. In a single cycle of the pump, three sodium ions are extruded from and two potassium ions are imported into the cell.

Explanation:

Hope I helped!

5 0
2 years ago
Count up the number of atoms on each side of the equation below and write this in the chart.
ivann1987 [24]

Answer:

The equation to this question is unclear. The clear equation is:

CH4 + 2O2 → CO2 + 2H2O

Please find the number of atoms of each element on the reactant and product side below.

Explanation:

An atom is the smallest indivisible part of an element. The atom retains the chemical properties of the chemical element. In order to ensure that a chemical reaction between molecules and compounds is BALANCED, the number of atoms of each element that makes up the molecule/compound must be the same on both the reactants and products side.

In this case, the chemical reaction involves:

CH4 + 2O2 → CO2 + 2H2O

1. Carbon atom (C):

Reactants side = 1 atom

Products side = 1 atom

2. Oxygen atom (O):

Reactants side = 4 atoms

Products side = 4 atoms

3. Hydrogen atom (H):

Reactants side = 4 atoms

Products side = 4 atoms

4 0
2 years ago
The retinoblastoma protein, pRB, is a tumor-suppressor protein that controls the G1/S cell-cycle checkpoint. While pRB is presen
gladu [14]

Answer:

1. pRB phosphorylated: The cell will not remain in G1 phase i.e. it will enter S phase because pRB will be degraded.

2. pRB not phosphorylated: The cell will remain in G1 phase i.e. will not enter S phase because pRB will remain bound to E2F.

3. pRB bound to E2F: The cell will remain in G1 phase i.e. will not enter S phase.

4. pRB not bound to E2F: The cell will not remain in G1 phase i.e. it will enter S phase.

5. E2F bound to DNA: The cell will not remain in G1 phase i.e. it will enter S phase.

6. CDK4 bound to Cyclin D1:  The cell will not remain in G1 phase i.e. it will enter S phase.

Explanation:

Retinoblastoma protein, pRB supresses tumor by regulating cell cycle progression in G1 phase. When a transcription factor known as E2F is bound to pRB the cell remains in G1 phase and did not proceed further to enter S phase. But as soon as pRB becomes phosphorylated, E2F becomes free and causes gene expression of cyclin E and and cyclin A which are required in progression of cell cycle from G1 phase to S phase.

<u>Signaling involved in cell cycle progression from G1 phase to S phase. </u>

When a cell is unstimulated, pRB is bound to E2F but G1 phase specific growth factors induce the expression of cyclin D through Ras-MAP kinase pathway.

Synthesis of cyclin D leads to the activation of CDK-4 which is a serine-threonine kinase. This kinase causes phosphorylation of pRB which results in the degradation of pRB.

Because of degradation of pRB, <u>E2F becomes free</u> and leads to the expression of cyclin E and and cyclin A which are S phase specific cyclins. This is how cell progresses from G1 phase to S phase.

E2F is a transcription factor which causes expression of S phase specific cyclins i.e. cyclin E and and cyclin A. So, E2F bound to DNA will result in cell cycle progression from G1 phase to S phase.

7 0
2 years ago
Compare a cup of hot tea to a lake. Choose the best response.
user100 [1]

Answer:

the hot tea has more thermal energy and higher temperatures

8 0
2 years ago
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