BIOLOGY HIGH SCHOOL

Dmitri Mendeleev and Henry Moseley developed their periodic tables about forty years apart. During that time, many discoveries in chemistry were made. Which fact was most likely discovered between the time of Mendeleev’s table and the time of Moseley’s table that helped Moseley develop his version? a. Atomic mass is the average mass of different samples of the same element. b. Different elements can have similar chemical properties even if their atomic masses are different. c. The number of protons in an atom is different than the atom’s total mass. d. Protons strongly affect an element’s atomic mass, while the electrons in atoms do not.

Answers

Answer 1
Answer:

The fact that most likely discovered between the time of Mendeleev’s table and the time of Moseley’s table helped Moseley develop his version is as follows:

  • The number of protons in an atom is different than the atom’s total mass.

Thus, the correct option is C.

What is Mendeleev's periodic table?

Mendeleev's periodic table may be defined as a systematic positioning of elements on the basis of their increasing atomic mass in a table form. It also reflects similarities and fashion in the behavior of elements.

Mendeleev's periodic table helped Moseley to a major extent. All the drawbacks of Mendeleev's periodic table are shorted out by Moseley in a more efficient way.

One of them was that the number of protons in an atom is different than the atom’s total mass because the total atomic mass of an element depends on the number of protons, neutrons, and electrons. Altogether they constitute the element.

Therefore, the correct option for this question is C.

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Answer 2
Answer:

Answer: The number of protons in an atom is different than the atom’s total mass.

Explanation: I had the test and got the answer correctly.

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Animals have more mechanisms for asexual reproduction than plants.
a. True
b. False

Answers

b.False. Animals usually reproduce sexually, most are not made to reproduce asexually. Plants reproduce asexually.

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and by depicting them in a cladogram. Which of the following best describes a challenge in classifying organisms this way ?A) millions of species on earth & cladogram not practical
B) impossible to tell which organisms are closely related on cladogram
C) cladograms are detailed oriented and impossible to show evolutionary relationships
D) there is limited number of ways to classify information some many of cladograms end up looking similar

Answers

Cladograms are detailed oriented and impossible to show evolutionary relationships and this among the following statements best describes a challenge in classifying organisms in this way. The correct option among all the options that are given in the question is the third option or option "C".

Ans. (C). cladograms are detailed oriented and impossible to show evolutionary relationships.

Cladistics can be defined as a method to biological classification, by which organisms are categorized in different groups on the basis of most common recent ancestor.

Cladograms only provide relations between different organisms on the basis of physical appearance and do not show genetic constitute of organisms.

Thus, the correct answer is option (C).

Which reagent is used to test for protein?

Answers

Answer:

Biuret reagent is the correct answer.

Explanation:

Biuret reagent is used to test the presence of the protein in a solution.

The biuret solution contains

  • Potassium hydroxide solution.
  • Hydrated Copper sulfate.
  • Potassium sodium tartrate.

Biuret reagent is a solution that is blue in color and when it reacts with protein the color gets a change to pink-purple due presence of several peptide bonds and when there is no protein present in the solution the color remains blue.

The biuret reaction takes place when the copper II ions placed in the solution as a cupric sulfate gets reduce to copper I ions due to the presence of peptide bonds and the color change is observed from blue to violet.

The biuret reagent is used to test for proteins. A biuret test, also known as a peptide bond test, is a chemical test used to measure the number of peptide bonds present in an analyte.

Biuret reagent consists of NaOH (sodium hydroxide) and hydrochlorofluorocarbons (sulfate) and potassium sodium tartrate. The tartrate is added to the chelate to stabilize the cupric ions.

When pure, the reagent is a pale blue color. However, when the reagent is mixed with protein, the reaction results in a light purple color. The deep blue/purple color is caused by a copper ion complex with a protein amide group.

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A scientist tries to mate the two similar-looking fruit flies Drosophila melanogaster and Drosophila simulans. He finds that they are unable to produce viable offspring. What kind of evolutionary barrier could this be? A. Chromosomal
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C. Physical

Answers

A Drosphila melanogaster and a Drosphila simulans are unable to produce viable offspring because of (B) Postzygotic evolutionary barrier. This is because the hybrid of the two cannot regularly form their genes together. When this does happen, the offspring generally does not live because the baby cannot mature enough and it usually dies before being born.

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B. Amino acid cells
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D. Macrophages

Answers

D. Macrophages


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Which is the best characteristic that distinguishes the kingdom Archaebacteria from the kingdom Eubacteria

Answers

i WOULD SAY...
The archaebacteria - are found in more complex areas such as a volcanic and bottom of the sea.
Eubacteria are the most common ones. Their found everywhere, in our bodies, food, etc.

Answer: cell wall structure

Explanation:
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