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3 years ago

Why can't more than one sperm enter an egg?

1 answer:

3 0

Only one sperm normally fuses with an egg because if more than one sperm fuses, through a process called polyspermy, development of the zygote usually stops.


Fertilization of one egg by two sperm is possible, but the resulting zygote is almost never viable because such a zygote would have three sets of chromosomes instead of the normal two. This condition, called triploidy, is usually incompatible with life. Those rare triploid infants that do survive to term have severe and multiple birth defects and rarely live more than a few days.

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Which of the following is true about viruses?

Ksenya-84 [330]

Answer:

Explanation:

Viruses depend on the host cells that they infect to reproduce. ... When it comes into contact with a host cell, a virus can insert its genetic material into its host, literally taking over the host's functions. An infected cell produces more viral protein and genetic material instead of its usual products.

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2 years ago

Read 2 more answers

What are the causes and effects of climate change?

Vikki [24]

Answer:

causes of climate change:

Greenhouse Gases

Solar Activity

Agriculture

Deforestation

Human Activity

Livestock

effects of climate change:

Extreme Weather

Safety & Economic Challenges

long term impact of climate change:

Health

Negative Impact in Ecosystems

Water & Food Resources

Sea Levels Rising

Shrinking Ice Sheets

Ocean Acidification

solutions to climate change:

Purchase Renewable Energy Certificate for your home power needs

Make your home energy efficient

Buy carbon offsets

Adopt a plant-based diet

Reduce food waste

Recycle

Stop using fossil fuels

Stop deforestation

Explanation:

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2 years ago

What is innate immunity? Discuss the barriers associated with innate immunity.

Rama09 [41]

Answer:

Innate immunity is a nonspecific defense mechanisms that play its role as soon as an antigen appear in the body (it is relatively rapid but nonspecific and because of that it is not always effective)

Explanation:

The barries of innate immunity are:

Skin: At Epidermal surface, its protective aspect are keratinized cells that lives on the surface, known as Langerhans cells.

Skin sweat or secretions: Their specific defense is sweat glands and sebaceous glands, and their protective aspect is low ph and washing action.

Mucosal surfaces: they are at the mucosal epithelium, and their protect aspects are nonkeratinized epithelial cells.

Oral cavity: They defend salivary glands through Lysozyme

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3 years ago

Glucose labeled with 14C in C-3 and C-4 is completely converted to acetyl-CoA via glycolysis and the pyruvate dehydrogenase comp

Morgarella [4.7K]

Answer:

The correct answer is option d.

Explanation:

The production of Acetyl-CoA takes place by the dissociation of both carbohydrates and lipids in the process of glycolysis and beta-oxidation. It then moves into the TCA cycle in the mitochondria and combines with oxaloacetate to give rise to citrate.

In the given case, no labeling will be found in the acetyl-CoA. The labeled C3 and C4 carbon of glucose signify the carboxyl carbon of pyruvate. In the succeeding reactions of the transformation of pyruvate to acetyl-CoA, the carboxyl carbon gets lost in the form of carbon dioxide. Thus, acetyl-CoA does not comprise any labeled C3 and C4 of glucose.

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3 years ago

An experiment measures the breaking point of identical strips of Woodgate from different trees. The procedure must contain which

aleksandrvk [35]

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3 years ago