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SIZIF [17.4K]
3 years ago
15

1. What allows things to enter and leave a cell and is the gate keeper?

Biology
2 answers:
andre [41]3 years ago
7 0
The cell membrane is the gatekeeper.
IgorLugansk [536]3 years ago
5 0

Answer:  The cell membrane; which is "selectively permeable" .

____________________________________________________

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. In which phase of cellular respiration is glucose a substrate?​
vodka [1.7K]

Explanation:

During glycolysis, enzymes act on the substrate, glucose. Glycolysis occurs in the cytoplasm; here, 2 molecules of ATP are used to cleave glucose into 2 pyruvates,  4 ATP and 2 electron carrying NADH molecules.

Further Explanation:

In all eukaryotic cells mitochondria are small cellular organelles bound by membranes, these make most of the chemical energy required for powering the biochemical reactions within the cell. This chemical energy is stored within the molecule ATP which is produced. Respiration in the mitochondria utilizes oxygen for the production of ATP in the Krebs’ or Citric acid cycle via the oxidization of pyruvate( through the process of glycolysis in the cytoplasm).

overall: C6H12O6 (glucose) + 6 O2 → 6 CO2 + 6 H2O + ≈38 ATP

Oxidative phosphorylation describes a process in which the NADH and FADH2 made in previous steps of respiration process give up electrons in the electron transport chain these are converted it to their previous forms, NADH+ and FAD. Electrons continue to move down the chain the energy they release is used in pumping protons out of the matrix of the mitochondria.

This forms a gradient where there is a differential in the number of protons on either side of the membrane the protons flow or re-enter the matrix through the enzyme ATP synthase, which makes the energy storage molecules of ATP from the reduction of ADP.  At the end of the electron transport, three molecules of oxygen accept electrons and protons to form molecules of water...

  • Glycolysis: occurs in the cytoplasm 2 molecules of ATP are used to cleave glucose into 2 pyruvates,  4 ATP and 2 electron carrying NADH molecules.
  • The Kreb's cycle: in the mitochondrial matrix- 6 molecules of CO2 are produced by combining oxygen and the carbon within pyruvate,  2 ATP oxygen molecules, 8 NADH and 2 FADH2.
  • The electron transport chain, ETC: in the inner mitochondrial membrane, 34 ATP, electrons combine with H+ split from 10 NADH, 4 FADH2,  renewing the number of electron acceptors and 3 oxygen; this forms 6 H2O, 10 NAD+, 4 FAD.

Learn more about cellular life at brainly.com/question/11259903

Learn more about cellular respiration at brainly.com/question/11203046

#LearnWithBrainly

5 0
4 years ago
Which organ contains alveoli, bronchioles, and bronchi that are moist with mucus and lined with cilia?
almond37 [142]
<span>The organ that is home to alveoli, broncioles, and bronchi which are moist with mucus and line with cilia are the lungs. The lungs are used to bring oxygen into the body and carry it to the heart which in turn pumps it throughout the entire human body to all the other organs.</span>
3 0
4 years ago
How does mutation lead to variation
saul85 [17]
Mutations<span> are changes in the DNA. A single </span>mutation<span> can have a large effect, but in many cases,  change is based on the accumulation of many </span>mutations<span>. Gene flow is any movement of genes from one population to another and is an important source of the genetic </span>variation<span>.</span>
5 0
3 years ago
Helpppppp HAHAHAHHAHA IM STRUGGLING
OlgaM077 [116]

Answer:

Option D = 3.4 g/mL

Explanation:

Given data:

Volume of water = 21.2 mL

Volume of water + object = 27.8 mL

Mass of object = 22.4 g

Density of object = ?

Solution:

First of all we will calculate the volume of object.

Volume of object = Volume of water+ object - volume of water

Volume of object = 27.8 mL - 21.2 mL

Volume of object = 6.6 mL

Density of object:

d = m/v

d = 22.4 g/ 6.6 mL

d = 3.4 g/mL

4 0
4 years ago
Which of the following explains how movement of material within earth causes volcanic eruptions
EleoNora [17]

The following choices are provided;

One plate moves below the other due to the movements in the inner core.

One plate moves below the other due to the movements in the mantle.

A plate slides past another due to the movements in the inner core.

A plate slides past another due to the movements in the mantle

The answer is; One plate moves below the other due to the movements in the mantle.

It is common that such convergent boundaries have a cascade of volcanic ranges. This is because as the oceanic plate moves below the continental plate the pressure and high temperatures cause the rock to melt and become magma. The magma makes it way up the crust through fissure and erupts.

6 0
4 years ago
Read 2 more answers
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