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PilotLPTM [1.2K]
3 years ago
11

B-cells and T-cells fight off the threat by producing _______. ............................

Biology
1 answer:
Ludmilka [50]3 years ago
6 0
B-cells fight bacteria and viruses by making Y-shaped proteins called antibodies, which are specific to each pathogen and are able to lock onto the surface of an invading cell and mark it for destruction by other immune cells
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Which of the following best describes a nuclear fusion reaction?
Jet001 [13]

Answer:

A reaction that joins the nuclei of two atoms into one  

Explanation:

Think of the words "nuclear fusion".

Nuclear = "relating to a nucleus"

Fusion = "joining"

So, nuclear fusion is the joining of two nuclei into one.

A and B are wrong, because chemical reactions involve electrons.

D is wrong, because the splitting of a nucleus is fission.

8 0
3 years ago
Match each rock with the correct description.
Sergio039 [100]

Answer:

quartizide - 5

limestone - 1

shale - 3

basalt - 4

sandstone - 2

correct me if im wrong.

8 0
3 years ago
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HELP!! Examine the model depicting the relationship between photosynthesis and cellular respiration. Select ALL of the choices t
joja [24]

Answer:

water and oxygen

Explanation:

The model in the image depicts photosynthesis and cellular respiration processes. Photosynthesis involves the synthesis of glucose and oxygen from carbon dioxide and water while cellular respiration involves the production of carbon dioxide and water from glucose and oxygen. This means that both reactions are opposite of one another.

According to the model, B is the product of cellular respiration in the mitochondrion used by photosynthesis while D is the product of photosynthesis in the chloroplast used by cellular respiration. B is likely water (H2O) while D is likely oxygen based on the provided options.

6 0
3 years ago
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In active cells, pO_2 may be 10 torr at the cell surface and 1 torr at the mitochondria (the organelles where oxidative metaboli
Lelechka [254]

Answer:

A) myoglobin binds the oxygen by means of iron

B)myoglobin would be an effective O_2-transport in other tissues

Explanation:

8 0
3 years ago
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List three differences between dna and rna molecules.
Vsevolod [243]

Answer:

Explanation:

RNA is single stranded While DNA is double stranded

RNA contains uracil while DNA contains thymine

RNA as the sugar ribose while DNA has the sugar deoxyribose

6 0
3 years ago
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