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DaniilM [7]
3 years ago
15

Dr. Roberts examined the cells of four different organisms for the presence of various cellular structures. His observations are

recorded in the table below. (An "X" indicates that the structure is present in the cell.)
cell
membrane cell wall chloroplasts mitochondria nucleus ribosomes vacuoles
1 X X X X X X X
2 X X X X X
3 X X X
4 X X X X
Using the information in the table, which of the cells most likely came from an animal?
Biology
1 answer:
MAVERICK [17]3 years ago
8 0
2 because animals do not have chloroplast or a cell wall
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What is the relationship between proto-oncogenes and oncogenes?
SCORPION-xisa [38]

Answer:

Oncogenes result from a mutation in  proto-oncogenes.

Explanation:

  • Protooncogenes control the growth and division of cells.
  • The proteins encoded by proto-oncogenes include growth factors, growth factor receptors, transcription factors and signal transducers.
  • They contribute to the transformation process by driving cell proliferation or reducing sensitivity to cell death.
  • Several types of genetic and epigenetic changes convert these proto-oncogenes to oncogenes.
  • Oncogenes arise due to the changes that increases the expression of proto-oncogenes .
  • Oncogenes are one of the causes of cancers.

A proto-oncogenes can turn into oncogene by following ways:

  • A point mutation  such as deletion, insertion and substitution  in the proto-oncogene can lead to formation of oncogenes.
  • Chromosomal translocation may result in activation of proto-oncogene as seen in Burkitt's lymphoma.
  • Insertion of a mobile genetic material such as retrovirus changes the gene expression, but leaves their coding sequence intact.
  • Activation of proto-oncogene can also occur from reduplication and amplification of DNA sequence.
3 0
3 years ago
A point in development when organisms are particularly susceptible to certain kinds of stimuli in their environments, but the ab
kaheart [24]

The correct answer is B. Sensitive period

Explanation:

In development, the sensitive period refers to a lapse of time in which organisms are more susceptible or receptive to stimuli and therefore during this time there can be great advances in development. Additionally, different from critical periods sensitive periods do not imply irreversible consequence if the stimuli are not presented. For example, in human beings from birth to the age of 6 years, children are more receptive to learn and acquire certain skills such as learning a new language if exposed to it and therefore this can be considered as a sensitive period. Considering this, it can be concluded the definition presented refers to the Sensitive period.

7 0
3 years ago
Removing a new cologne or bath product from the resident's room for your personal use is abuse
allsm [11]

Answer:

False

Explanation:

This might not even be considered stealing if the person removing the cologne puts it back but it is definitely not considered abuse which is where someone verbally or physically does harm to the victim.

4 0
1 year ago
Describe how the ecosystem changed from figure 1 to figure 4.<br> no links, please. <br> thank you
AysviL [449]

Answer:

In the ecosystem, the tides of the water rise in each figure. In figure 4, there is an increase in land animals present, and a lower amount of aquatic animals present. In the first figure, there are no birds, however there are multiple in the rest of the figures, this is possibly due to migration in the winter or that the ecosystem has drawn birds near. The types of plants change throughout each figure which is most likely to new adaptations such as more water available. The tides most likely rose because of more precipitation.

Explanation:

I hope this helped.

5 0
2 years ago
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How do flowering plants reproduce by fertilization if they are immotile?
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