What structure does a eukaryotic cell have that a prokaryotic cell does not?

Answers

Answer 1

Answer:

The answer is a Nucleus. Eukaryotic cells have nuclei while;e prokaryotic cells do not.

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Secondary succession can only occur as a transition from primary succession.

Answers

false because it's falsely

Answer:

false

Explanation:

edge 2022

1. Lemon juice is a weak acid. It has a [H+] of 5.0 × 10^-2 M. What is the pH of lemon juice? A. 1.0
B. 1.3
C. 5.0
D. 7.5 2. Water can act as both an acid and a base in an ionization reaction to form H+ and OH- ions. What is this phenomenon called?
A. neutralization
B. acid dissociation
C. base dissociation
D. self-ionization 3. A solution of vinegar and water has a pH of 6.2. What type of solution is this?
A. acidic
B. basic
C. neutral 4. Hydrochloric acid (HCl) and acetic acid (HC2H3O2) are both acids. HCl completely dissociates in water, while HC2H3O2 does not. Which of the following statements best describes these two acids?
A. HCl is a strong acid; HC2H3O2 is a strong acid.
B. HCl is a weak acid; HC2H3O2 is a weak acid.
C. HCl is a strong acid; HC2H3O2 is a weak acid.
D. HCl is a weak acid; HC2H3O2 is a strong acid.
5. Pyridine is a weak base with the formula C5H5N. Pyridine reacts with water according to the following equation: C5H5N + H2O ---> C5H5NH+ + OH-. What is the formula for the dissociation constant for this base?
A. Kb = [OH-][C5H5NH+]/[C5H5N]
B. Kb = [H+][CO2H-]/[C5H5N]
C. Kb = [C5H5N]/[OH-][CO2H-]
D. Kb = [C5H5N][CO2H-]/[OH-]

Answers

I am pretty sure these answer wil help you! Regards.

1) B. 1.3
2) D. self-ionization
3) B. basic
4) C. HCl is a strong acid; HC2H3O2 is a weak acid.
5) Kb = [OH-][C5H5NH+]/[C5H5N]

Answer: 1. B. 1.3

2. D. self-ionization

3. A. acidic

4. HCl is a weak acid; $CH_3COOH$ is a weak acid.

5. A. $K_b=([OH^-][C_5H_5NH^+])/([C_5H_5N])$

Explanation:

1. pH is the negative logarithm of hydrogen ion concentration.

$pH=-log[H^+]$

Given: $[H^+]=5.0* 10^(-2)=0.05$

$pH=-log[0.05M]=1.30$

2. An acid is a substance which donates $H^+$ ions when dissolved in water.

A base is a substance which donates $OH^-$ ions when dissolved in water.

Thus as water ionizes to give both ions, it acts as both acid and base.

$H_2O\rightarrow H^++OH^-$ which is called as self ionization.

3. pH is the measure of acidity or alkalinity of a solution. \Acids have pH less than 7, neutral solutions have pH of 7 and basic solutions have pH more than 7.

As the given solution has a pH of 6.8 which is less than 7, it is an acidic solution.

4. Strong acids are those acids which undergo complete dissociation when dissolved in water.

$HCl\rightarrow H^++Cl^-$

Weak acids are those acids which do not undergo complete dissociation when dissolved in water.

$CH_3COOH\rightleftharpoons CH_3COO^-+H^+$

5. Dissociation constant is the ratio of product of concentration of products to the product of concentration of reactants each raised to their stochiometric coefficients.

$C_5H_5N+H_2O\rightarrow C_5H_5NH^++OH^-$

$K_b=([OH^-][C_5H_5NH^+])/([C_5H_5N])$

The concentration of water is ignored as it is in large excess and thus does not effect the dissociation of pyridine.

One group of scientists has proposed a new theory on Adaptation. A majority of scientists worldwide agree with the theory. The theory is most likelyA.biased.
B.incomplete.
C.accurate.
D.unchangeable.

Answers

The theory is most likely accurate and the main reason behind this process of thinking is because a majority of the scientists around the world agree with the theory. It can never be biased or incomplete. The correct option among all the options that are given in the question is the third option or option "C".

Answer: The correct answer is-

C.accurate.

As per the information in the question, a group of scientists has proposed a new theory on Adaptation, which is accepted by majority of scientists worldwide. This indicates that the proposed theory is most likely to be accurate.

A scientific theory is an explanation of certain aspects of nature that is based on some facts as well as evidences. It is tested, observed, and proven right on the basis of repeated experimentation.

As the theory on Adaptation is accepted by majority of the scientists, it means that it is most likely to be accurate.

Thus, option C) is the right answer.

When floral design first emerged as an art form, which technique was emphasized?

Answers

using flowers in their natural state and shape

Hanna hypothesizes that granite is denser than sandstone. How can Hanna test her hypothesis?

Answers

To test if the hypothesis is correct, a good way is to think of it this way:
Density = mass/volume, right?
Calculate the mass and volume of each and do the equation; this will test your hypothesis.
You will be left with the density of each. But, make sure that the sample sizes are the same (controlled variable) otherwise it will be an unfair test.

Of the following, which has the highest entropy?NaCl(s)

NaCl(aq)

NaCl(l)

NaCl(g)

Answers

The higher the order, the lower the entropy. Solids are most orderly and gases are least orderly, with liquids and aqueous in between. That said, NaCl(g) would have the highest entropy.

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