BIOLOGY HIGH SCHOOL

Question 12An allotrope of carbon that is soft and can be used as a lubricant is ____.


A)diamond

B)graphite

C)sand

D)silicon

Answers

Answer 1
Answer:

Answer:

Graphite is the only allotrope of carbon which is acts as lubricant and it is soft in texture.

Option: B

Explanation:

The atoms of graphite are set in a hexagonal structure. Graphite is soft because the atoms are bounded by Van deer Waal forces which are week.

This graphite is called as dry lubricant as the carbon atoms are loosely packed and free to move hence, it is used as lubricant. As graphite is a dry lubricant this can be used where wet lubricant is not being used. It is only non-metal which is electrically conductive.  
Answer 2
Answer:

Answer:D

Explanation:if I know ittttt

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How was the process used to construct the tree of life by Carl Woese different from the process used by Jill Banfield?

Answers

Answer and Explanation:

  • Carl Woese used ribosomal RNA genes to study the evolution of living beings. He used these genes because they are present in all organisms, and they all have the same function. The nucleotide sequences change very little, giving a real evolutive vision. Woese compared ribosomal genes among different living beings. The sharper the sequence variation is among two organisms, the bigger the evolutive divergence is. This divergence drowned in a phylogenetic tree shows three well-differentiated domains: Archea, Bacteria, and Eukarya.
  • Jillian Banfield used genes from 16 ribosomal proteins from many different unknown microorganism species. She and her team used metagenomic methods that are the simultaneous analysis of multiple genomes belonging to many organisms in the same sample. These methods allowed detecting different organisms, even when these were neither previously observed nor lab-cultivated. The comparison among these new genomes with many others already known made a place for the construction of a new and more detailed tree of life where many new branches emerged from the three domains.

A star at the end of its life-cycle, composed of mostly carbon, is a A. nova.
B. giant.
C. red dwarf.
D. white dwarf.

Answers

A star at the end of it's life cycle is called a white dwarf (answer D). The order of life in the answer choices given is giant, red dwarf, white dwarf and nova. The nova, while the final stage is actually the explosive death of a star. The white dwarf state is a small, hot star that is that is dense in composition and composed of mostly carbon and oxygen. 

Answer: D. White Dwarf

Explanation:

Which kingdom contains organisms that are multicellular, heterotrophic, eukaryotic, and lack cell walls?

Answers

Animalia is the correct answer. Hope it helped you. Please mark as the brainliest answer if it helped

Answer:

Animilia

Explanation:

i looked off the other guy

According to the biological species concept, for speciation to occur, _____. according to the biological species concept, for speciation to occur, _____. the number of chromosomes in the gene pool must change large numbers of genes that affect numerous phenotypic traits must change at least one gene, affecting at least one phenotypic trait, must change changes to centromere location or chromosome size must occur within the gene pool

Answers

The answer is; at least one gene, affecting at least one phenotypic trait, must change

This change, due to mutation, may result in an extreme trait in a small proportion of the population . If this extreme trait proves to be favorable with the environment it will continue to increase in the population with every generation. Eventually, the trait will become common in most individuals and the population will have speciated.


The alleles for eye color in fruit flies involves one allele that might contain the sequence CCAT. Assume that this allele produces red eyes in a fruit fly, because the allele produces a protein that makes red pigment. Assume that another allele of this gene has a slightly different sequence in the middle: CAAT, instead of CCAT.Which of the statements below is true about the alleles for eye color in fruit flies?

Which of the statements below is true about the alleles for eye color in fruit flies?

A)
The alleles for eye color produce the same phenotype.


B)
The small change in the DNA sequence causes the allele to produce a different protein, resulting in the production of white eyes instead of red eyes in the fruit fly.


C)
Changes in the sequence of DNA bases in a gene do not contribute to genetic variation in the fruit fly population

Answers

Answer:

The correct answer would be B)  The small change in the DNA sequence causes the allele to produce a different protein, resulting in the production of white eyes instead of red eyes in the fruit fly.

The amino acid sequence of any protein is determined by the codon sequence of the mRNA which is in turn determined by the nucleotide sequence of the DNA.

Thus, if the nucleotide sequence of the DNA is changed, it will result in the change of amino acid sequence of the protein.

It may result in the change of the structure as well as the function of the protein.

Thus, if the sequence in the gene is changed slightly, it would not result in the production of protein required for a red color trait.

Hence, the eye color of the fruit fly would change to white.
I'm quite sure answer B is correct :)

Jack is examining a plant stem slide under the microscope. He can distinctly identify the epidermis, sclerenchyma, and phloem tissues. Arrange the tissues according to the tissue systems that they belong to.

Answers

Epidermis - Dermal Tissue
Sclerenchyma- Ground Tissue
Phloem- Vascular Tissue
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