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3 years ago

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Which cell in the body are thought to remain in the Go phase during the cells'life cycle? A. Neurons in the brain B. Vesicles in

the brain. C. Marrow in the bone. D. Red blood cells.

1 answer:

Westkost [7]3 years ago

8 0

A. Neurons in the brains

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Experiments on the positive phototropic response of plants indicate that ______. A. light destroys auxin B. auxin moves down the

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The answer is auxin can move to the shady side of the stem.

Phototropism is a reaction to environmental factors. It is a plant's response to sunlight in the form of movement. In plants, phototropism is very prevalent. In actuality, it is necessary for plant growth. Other plant movements also occur in response to touch, water, gravity, and other factors. Phototropism was discovered due to well-known experiments by Charles Darwin and Boysen Jensen.

There are two types of phototropism:

Positive phototropism

Negative phototropism.

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SIZIF [17.4K]

Answer:

2x - 9y = 23

5x - 3y = -12x - 9y = 23

5x - 3y = -12x - 9y = 23

5x - 3y = -12x - 9y = 23

5x - 3y = -12x - 9y = 23

5x - 3y = -12x - 9y = 23

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Explanation:

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3 years ago

Nuclei with an _____________ number of protons and neutrons possess a property called spin. Nuclear spin can be thought as eithe

andriy [413]

Answer:

Explanation:

$\text{We are to fill in the blanks with the correct words that best suit the blanks}$

$\text{Nuclei with an} \ \mathbf{odd} \ \text{number of protons and neutrons possess a property }$

$\text{called spin. Nuclear spin can be thought as either up or down with the spin }$

$\mathbf{magnetic \ field.}$

$\text{When a molecule is placed in an NMR, a large} \ \mathbf{magnetic} \ \text{field is applied making the }$ $\text{spin states become of unequal energy, with the spin that generates a magnetic field }$ $\text{in the same direction of the applied magnetic field being}\ \mathbf{ lower} \ \text{ in energy. The NMR }$ $\text{then uses} \ \mathbf{ radio \ frequency}\ \text{ to 'flip the spin' of each nuclei, wherein each nuclei will }$ $\text{require a specific energy level of radiation that corresponds to its difference in }$ $\text{energy of spin states, this is often called the nuclei's}\ \ \mathbf{resonance } \ \text{frequency, }$ $\text{which is measured by the NMR and translated to teh final spectra.}$

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2 years ago

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C Color of light are you in connections

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3 years 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:

<u>Acute Lymphoblastic Leukemia (ALL)</u>

Explanation:

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

<u>INTRODUCTION:</u>

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

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

<u>PATHOPHYSIOLOGY:</u>

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

The blast cells <u>infiltrate the bone marrow</u> and replace it. Since RBCs are produced by the bone marrow, pathological infiltration results in the <u>decrease in the number of RBCs produced</u>. This may <u>manifest as anemia with decreased Hemoglobin concentration</u> 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.

<u>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.</u>

<u>QUESTION:</u>

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.

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

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.

<u>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.</u>

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3 years ago