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anastassius [24]
3 years ago
5

How do you think the high rates of HIV transmission in humans might be related to the length of time it takes for the virus to d

evelop into AIDS?
Biology
1 answer:
Nadya [2.5K]3 years ago
3 0
They’re sexually transmitted
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Heterocysts A. are found in nitrogen-fixing cyanobacteria.B. are used to protect nitrogenase.C. produce catalase.D. generate oxy
BARSIC [14]

Answer:

E. are found in nitrogen-fixing cyanobacteria AND are used to protect nitrogenase.

Explanation:

Heterocysts are specialized cellular compartments found in nitrogen fixing cyanobacteria. They provide the ideal anaerobic environment for nitrogen fixation since nitrogenase enzyme cant work in presence of oxygen. Hence, in a cyanobacteria both the oxygen requiring photosynthesis process and the  oxygen sensitive nitrogen fixation process takes place simultaneously.

Heterocysts have an additional cell wall made of glycolipid that provides a hydrophobic barrier to oxygen. They are involved in production of nitrogenase and other proteins that are required for nitrogen fixation. They also degrade photosystem II which is responsible for producing oxygen and produce proteins which remove any remaining oxygen.

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As the hypothesis of sea-floor spreading predicts, the age of the ocean floor differs with location. What pattern does the ocean
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Yes the hypothesis of the sea-floor spreads through the ocean ageing
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How does the support structure of echinoderms differ from that of arthropods?
dimaraw [331]

Answer:

Arthropods have a tough, non-living outer shell called exoskeleton, which protect their soft bodies while echinoderms have living endoskeletons, which develops within the deeper skin or body tissues and act as their protective covering.Explanation:

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3 years ago
This subcellular structure functions to modify gene expression products before they are shuttled out of the cell via exocytosis.
Over [174]

Answer:

The correct answer will be- Golgi apparatus

Explanation:

The proteins are synthesized in the ribosomes whether they are attached to the endoplasmic reticulum or free. These synthesized proteins enter the lumen of the endoplasmic reticulum where they get packaged to go to Golgi apparatus.

The Golgi apparatus is the site of post-translational modification of the secreted proteins like ubiquitination, acetylation, phosphorylation and many others.

Thus, the Golgi apparatus is the correct answer.

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Which of the following describes a pod?
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Both answers C. and D. are correct. Most marine animals live in pods like seals, whales, and walrus. A. is called a school of fish while B. is a colony of penguins. :(
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