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Maslowich
3 years ago
14

What reaction prevents more than one sperm from binding to an oocyte during fertilization?

Biology
1 answer:
PilotLPTM [1.2K]3 years ago
7 0
The reaction is called ACROSOME REACTION. The acrosome reaction occurs during the sperm interaction with the egg before fertilization occur. The acrosome is a structure that is found on the head of the sperm, it contains a chemical called acrosin which the sperm used to penetrate the egg. Sperm which can not undergo acrosome reaction can not penetrate the egg for fertilization.
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The Vocabulary of Nutrition for Children, Adolescents, and Older Adults
mario62 [17]

Answer:

1. Picky eating; food jag

2. epiphyseal plates

3. bone mineral density (BMD)

4. obesity

5. food insecurity

6. life expectancy

7. arthritis

8. congregate meal

Explanation:

Picky eating is a behavior in early childhood when they refuse to eat certain foods and only want the same foods, while food jag is when a child only eats a small group of foods, meal after meal. The epiphyseal plate is a specialized layer of hyaline cartilage where chondrocytes (i.e., the only cells found in healthy cartilage) proliferate and differentiate during longitudinal bone growth. Arthritis is an inflammation of the joints caused by different reasons (e.g., injury, genetic causes, infections, immune system dysfunction, etc), whose risk increases with age. Bone mineral density (also known as bone density), is the amount of mineral in bone tissues, being the best manner to measure bone health. Obesity can be defined as an excessive amount of body fat that presents a risk to health. Over the past 30 years, the prevalence of obesity has doubled in children and tripled in adolescents, representing a serious health problem (especially in developed countries). Moreover, food insecurity is a social condition of limited access to food for individuals in a household to live an active, healthy life, which can be used as a metric of how many people cannot afford food. Life expectancy is an estimation of the number of years a person can expect to live in a given country/region. Life expectancy around the world has increased for nearly 200 years especially due to medical progress and access to food. Finally, a congregate meal refers to a healthy meal provided to anyone age 60 or over that encourages older adults' social connections with other persons at the meal sites.

8 0
3 years ago
What was Rudolph Virchow’s contribution to the cell theory?
Ghella [55]
<span>The first two tenets of the Cell theory were postulated by Schleiden and Schwann at the first half of the 19th century. Those tenets are that "all organisms are composed of one or more cells" and that "the cell is the basic unit of life". In 1855, Rudolf Virchow added the third tenet "Omnis cellula e cellula" which means that "all cells come from cells". In other words, cells can be formed only in the division of other cells.</span>
7 0
4 years ago
4) What is the most important chemical made during the light-independent reactions? It stores the energy that came from the sun.
Alex17521 [72]

The Calvin Cycle

Once in the mesophyll cells, CO2 diffuses into the stroma of the chloroplast, the site of light-independent reactions of photosynthesis.

7 0
3 years ago
Which of the following experiments would provide the best supporting evidence that neutrophils are the cause of the reperfusion
cluponka [151]

Answer:

Performing the ischemia/reperfusion experiment using neutrophil-depleted animals and examining whether the degree of tissue damage is reduced

Explanation:

Neutrophils are one of the important component of the white blood cells. Neutrophils has the ability to phagocytose the cell and these cells first reach at the time of parasitic infections.

In case of reperfusion experiment, the neutrophil cells can be used to obtain the best results. The variables that are used in the experiment can be tested and is limited in the absence and the presence of the neutrophil cells. The tissue damage can be diagnosed by this experiment.

Thus, the correct answer is option (B).

6 0
3 years ago
What are the roles of the chloroplasts and mitochondria?
Allushta [10]

Answer:

Explanation:

Mitochondria are the "powerhouses" of the cell, breaking down fuel molecules and capturing energy in cellular respiration. Chloroplasts are found in plants and algae. They're responsible for capturing light energy to make sugars in photosynthesis.

5 0
3 years ago
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