What is the name of the organic molecule modeled below? A propane B propene C propyne

Who is it important to study the cell in order to learn about DNA?

victus00 [196]

It is important to study the cell in order to learn about DNA is that there many different processes that help to keep a cell running. In order to know DNA, you need to familiarize yourself with mRNA, tRNA, and rRNA to learn the process of transcription and translation- two very important processes in DNA.

7 0

2 years ago

Under a microscope, a student observes a specimen containing a cell wall, nucleus, and chloroplasts.

mart [117]

Answer:

A plant cell b/c it has chloroplast

Explanation:

Chloroplast absorbs sunlight also known as light energy used for the process of photosynthesis.

5 0

3 years ago

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Help again......thanks

Sati [7]

C. Student B and D
Hope that helps!

8 0

2 years ago

Lymphocytes that destroy foreign cells or virus- infected cells are ________ cells.

nexus9112 [7]

Lymphocytes that destroy foreign cells or virus- infected cells are cytotoxic T cells.

<h3>What is cytotoxic T cell?</h3>

A particular class of immune cell that is capable of eliminating specific types of cells, such as virus-infected cells, cancer cells, and alien cells.
To destroy cancer cells, cytotoxic T lymphocytes can be isolated from other blood cells, cultured in a lab, and then administered to a patient.
White blood cells and lymphocytes both fall under the category of cytotoxic T lymphocytes.
It is also known as a killer T cell and a cytotoxic T cell.
The helper T cell and the cytotoxic T cell are the two main subtypes of T cells.
Helper T cells, as their names imply, "assist" other immune system cells, whereas cytotoxic T cells "kill" virally-infected cells and tumours.
The TCR cannot directly bind antigen, unlike an antibody.

Learn more about cytotoxic T cell here:

brainly.com/question/9234773

#SPJ4

8 0

1 year ago

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A 5-year-old boy has become increasingly lethargic for past 2 months. Bruising is noted on the skin of his lower legs. Hb 9.2 g/

mart [117]

Answer:

Acute Lymphoblastic Leukemia (ALL)

Explanation:

The 5 year old, male patient is most likely suffering from Acute Lymphoblastic Leukemia.

INTRODUCTION:

Acute Lymphoblastic Leukemia is also known as acute lymphocytic leukemia and acute lymphoid leukemia. It is the most common cancer of children.

This disease is marked by neoplasm composed by blast cells. Blast cells are immature B or T lymphocytes.

PATHOPHYSIOLOGY:

Blast cells are marked by scant cytoplasm, larger than usual nucleus, inconspicuous (small) nucleoli and delicate chromatin. These cells stain positive for Tdt marker ( terminal deoxynucleotidyl transferase). Tdt marker is absent in mature lymphocytes but present in immature lymphocytes and acute lymphoblastic leukemic cells. Majority of ALL cells stain positive for CALLA. CALLA stands for common acute lymphoblastic leukemia antigen. CALL is also known as CD 10 (cluster of differentiation 10).

The blast cells infiltrate the bone marrow and replace it. Since RBCs are produced by the bone marrow, pathological infiltration results in the decrease in the number of RBCs produced. This may manifest as anemia with decreased Hemoglobin concentration on complete blood count/ blood complete picture test. Platelet level will also be decreased due to bone marrow infiltration. Sometimes complete blood counts may reveal increased amounts of WBCs by counting immature blast cells as WBCs.

Decreased RBCs present as symptoms of anemia with patient complaining of fatigue and lethargy. Decreased platelet counts may result in bruising on skin as the ability to heal trivial wounds is decreased.

QUESTION:

Coming back to the question, there are many cues which point towards this diagnosis.

The age of the patient i.e. 5 years old implies us to consider pediatric diseases. ALL is the most common cancer occurring in children.

Lethargy warns us to consider anemia in the patient.

Bruising points towards decreased platelets in this patient. Low blood platelet count is called thrombocytopenia.

Hb 9.2 g/dL, Hct 27.8%, MCV 91 fL confirm anemia (Normal values in children; Hgb 11-13 g/dL, Hematocrit 34%, MCV 75-90 fL) and platelet count 101,000/µL establishes thrombocytopenia (normal platelet count is 150,000-450,000 per microliter). WBC count 12,128/µL is normal ( normal values in 4-7 years children 6,000-15,000 cells per microliter) in this patient.

Replacement of bone marrow by primitive cells with large nuclei, delicate chromatin; indistinct nucleoli with scanty cytoplasm is a typical feature of Acute Lymphoblastic Leukemia.

Positive staining for CALLA establishes acute lymphoblastic leukemia in this patient as this antigen is positive in ALL cells and this disease is also implied by the symptoms, history and laboratory tests of the patient.

3 0

2 years ago