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Monica [59]
3 years ago
15

Where do echinoderms live?

Biology
2 answers:
rosijanka [135]3 years ago
8 0
The phylum Echinodermata , which contains about 6000 species, gets its name from the Greek, literally meaning "spiny skin." Many echinoderms actually do have "spiny" skin, but others do not. This phylum exists exclusively in the sea, and cannot be found on land or in fresh water.
Schach [20]3 years ago
4 0

in a marine environment

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What is the energy requirement in kJ/mol to transport a proton across the mitochondrial inner membrane in plant cells at night w
lions [1.4K]

Answer:

C. +23.1 kJ/mol

Explanation:

the formula to use to calculate the energy requirement in kJ/mol to transport a proton across the mitochondrial inner membrane in plant cells is:

ΔGt = RTIn  \frac{C_{2} }{C_1}   + ZFΔV

let's list the values of the data we are being given in the question to make it easier when solving it.

Z= 1

F= 96500C (faraday's constant)

ΔV= 160mV = 0.160V

R= 8.314( constant)

T= 15ºC ( converting our degree Celsius into kelvin, we will have 273.15k+ 15 = 288.15K)

∴ T= 288.15K

Putting it all together in the formula, we have:

ΔGt = 8.314 × 288.15 × 2.303 log \frac{C_{2} }{C_1}  + 1  × 96500 × 0.160

ΔGt = 5517.25   [ -(log(H^{+}_{out} ) + log(H^{+}_{in} )_{in}  +15440

ΔGt  = 5517.25 (pH_{out} - pH_{in}  +15440

Given that the pH  differential gradient  across the membrane is 1.4pH units. It implies that;

ΔGt  = 5517.25 × 1.4 + 15440

=  7724.15 +15440

= 23164.15 Joules/moles

= +23.1 KJ/mole

4 0
3 years ago
Does anyone know how to answer this question? Please
Sergio [31]

Basically the question is asking you, out of these statements:

A) Meiosis results in four haploid daughter cells

B) Meiosis results in four diploid daughter cells

C) In both processes, DNA replication must occur

D) During meiosis the 2N mother cells produces N daughter cells

E) Mitosis is responsible for genetic continuity, in higher organisms it is essential for growth and repair

which one(s) are true. They provide you information (Venn diagram as well as paragraph) to help you solve this question.

The information tells us what's the correct answers.

Say for an example, the venn diagram tells us that unlike mitosis, during the process of meiosis the 2N mother cells produces N daughter cells (hence why you see the equation 2N ---> N only in meiosis' circle instead of in the middle [which signifies that both mitosis and meiosis shares this trait] or on mitosis' side [which signifies that only mitosis has this trait].) Therefore, D - or the fourth - answer choice is correct, so identify it as a true statement.

A - or the first answer choice - is correct as well. B - or the second answer choice - is not so do not identify it as true. In the paragraph it tells us that instead of two identical daughter cells with the same chromosome number (which is a diploid cell) and DNA, four daughter cells are produced with half the chromosome number, which is a haploid (think of half when you see haploid).

C - or the third answer choice - is right. In the paragraph is states that both processes have DNA replication take place. For mitosis it states "The parent cell goes through DNA replication(...)". For meiosis it states "(...) DNA replication still takes place (...)".

E - or the last answer choice - is correct. In the venn disgram, it has growth and repair under mitosis and the paragraph states that for mitosis, simple organisms use this process as a method of asexual production (which, by the way, maintains genetic continuity).

So, here's our recap:

A is a true statement. Identity it as true.

B is NOT correct thus do <em><u>not </u></em>identify it as true.

C is a true statement. Identify it as true.

D is true thus identify it as such.

E is too true. So, identify it.

Ways to identify includes and is not limited to:

* circling

* highlighting

* selecting

* writing T or true by what's true

* underlining the true statements

* checking the true statements with a check mark

You can signify B as untrue by writing F or false by it, crossing it out, putting an x by it, or simply leaving it be. It all depends on what you're able to do.

3 0
3 years ago
Anaerobes carry on whereas aerobes carry on cellular respiration
Tcecarenko [31]

Answer:

Anaerobes carry on cellular respiration in the absence of oxygen, whereas aerobes carry on cellular respiration in the presence of oxygen.        

Explanation:

Many of the cell processes needed need some energy to occur. Cellular respiration is the process by which cells degrade organic compounds and turn them into energy. Cellular respiration follows two ways, which depend on the presence or absence of oxygen, and both of them begin with the process of glycolysis, which occurs in the cytoplasm and does not need oxygen to occur.

<u>Aerobic Respiration</u>

  1. Occurs in the presence of free oxygen.
  2. Series of reactions by which pyruvic acid (product of glycolysis) turns into CO₂ and H₂O, producing many ATP molecules.
  3. Respiration occurs in the mitochondria.
  4. Takes place in two steps or stages: Krebs cycle and electron transporter chain.
  5. Glycolysis and Krebs cycle produce electrons, which then travel along the electron transporter chain while releasing energy, and ATP is produced.

<u>Anaerobic Respiration </u>

  1. Occurs in the absence of free oxygen
  2. Series of reactions by which using pyruvate (product of glycolysis) 2 ATP molecules van be produced.
  3. There are two ways in which anaerobic respiration can be produced: lactic fermentation and alcoholic fermentation.
  4. Lactic fermentation produces lactic acid and 2 ATP
  5. Alcoholic fermentation occurs in two steps, and the final products are ethylic alcohol, 2ATP, and 2 CO₂
  6. The whole anaerobic process occurs outside the mitochondria.
6 0
3 years ago
Which of the following individuals is most likely to allow a recessive lethal gene to be kept in a population over several gener
Lynna [10]
 the answer is c. heterozygous
3 0
3 years ago
Certain foraminifera (shelled protozoa) have inconsistent fossil records. Which mode of evolution do they represent? A.adaptive
4vir4ik [10]
The correct answers (c.) punctuated equilibrium.Punctuated equilibrium is a mode of evolution that the certain foraminifera (shelled protozoa) represents. It is , in fact, the hypothesis of the evolutionary development of rapid episodes that is marked between long periods of little or even with no change at all. 
3 0
3 years ago
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