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Crazy boy [7]
3 years ago
15

The cells directly responsible for cellular immunity are the ________ cells.

Biology
1 answer:
dlinn [17]3 years ago
7 0
The cells directly responsible for cellular immunity are the cytotoxic T cells (lymphocytes).

    Cellular immunity is an immune response against infectious diseases caused by viruses and some bacteria. This mechanism does not involve antibodies, but rather cytotoxic T-lymphocytes, phagocytes and the release of cytokines in response to an antigen. <span>Cytotoxic T cells, perform their function by killing infected cells via apoptosis.</span>
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How does the theory of endosymbiosis differ from the autogenous and horizontal gene transfer theories in explaining the evolutio
Llana [10]
<h3><u>Answer and Explanation;</u></h3>
  • <u>Endosymbiotic theory</u> explains the origin of chloroplasts and mitochondria and their double membrane.  Mitochondria of eukaryotes evolved from aerobic bacteria living within their host cell and the chloroplasts of eukaryotes evolved from endosymbiotic cyanobacteria.
  • On the other hand according to the <u>autogenous hypothesis, </u>mitochondria and chloroplasts have evolved within the protoeukaryote cell by compartmentalizing plasmids or vesicles of DNA within a pinched off invagination of the cell membrane.
  • <u>Endosymbiont theory </u>is the theory that suggests that simple prokaryotic cells were engulfed by larger prokaryotes 1.5 billion years ago.
  • <u>Autogenous theory</u> is a theory that was proposed as an alternative to endosymbiont theory. proposes that eukaryotic organelles formed by infolding of the plasma membrane.
  • <u>Horizontal gene transfer theory</u> is an alternative to endosymbiont and autogenous theories for the origin of complex organelles in eukaryotes.
6 0
3 years ago
YOO ILL GIVE BRAINLIEST STUFF, I NEED THE WORD OF WHAT THE DEFINITION IS FROM THE GREEN COLOR TO THE PURPLE/PINK
djyliett [7]

Answer:

I think its Pigment

Explanation:

i hope that helped!

3 0
3 years ago
Which of the following is a reason why cells divide? A. to keep demands on their DNA low B. to mutate their DNA C. to increase t
Goryan [66]

Answer:

The answer is B.

Explanation:

When you skin your knee,  cells divide to replace old, dead, or damaged cells.

6 0
3 years ago
Read 2 more answers
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Allen Dexter, a 19-year-old college student, was rock climbing when he fell 30 feet to the ground. Paramedics arriving at the sc
a_sh-v [17]

Answer:

Explanation:

A cervical collar was used to avoid movement and prevent further damage incase he has a fracture.

light is focused in one eye,the pupil will constrict as a respond to the light flashed. It is repeated Again and observed.

The vitals were normal until he had the accident as the patient reached hospital his vitals were abnormal he had achycardia, severe hypotension, increased temperature and shallow breathing which is an indicator of C5 injury. After the surgery and the patient was treated he stabilises and achieved his vitals normal ranges in day 4 of admission.

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After the operation it was revealed that he has a damage on both sides of of his 5th Cervical bone which has lead to loss of sensation and strength in his upper arms and lower .It leads to incontinence in urine.

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