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Reptile [31]
3 years ago
10

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

Biology
1 answer:
Y_Kistochka [10]3 years ago
3 0
<span>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.


</span>
<span>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. </span>
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Which of the following was the MOST IMPORTANT thing Wilhelm Wundt did to move psychology from pseudoscience to science?
poizon [28]

number 1 c

number 2 d

number 3 a

number 4  b

5 a

3 0
3 years ago
Read 2 more answers
C and A<br> D and B<br> C and E<br> C and F
RideAnS [48]

Answer:

C and E

Explanation:

A wavelength, when drawn like this, is between two points in the exact same spot of the wave, but in different positions. Here, C is the middle when the wave is going "down" into the trough. The next point at this position is point E, giving us our answer.

7 0
2 years ago
What genes direct the
Valentin [98]

Answer:

a. hox genes.

Explanation:

HOX genes have the following functions:

  • HOX genes are the homeobox subset.
  • They specify the areas of the embryo's body plan along the animal head-tail axis.
  • They are encoding Hox proteins that specify the position characteristics and ensure that the right structures form at the right position in the body.
  • They regulate high-level executive genes, such as transcription factors and intracellular signaling molecules, which adhere, number, form, and growth to cells.

The vertebrates are highly preserved.

The clusters and other genes occur uninterrupted.

Evolutionary, the heterogeneous regulatory areas between the genes most previously present are larger and more preserved than those present at the other ends of the clusters.

The characteristical feature is that these are homeodomain proteins with a highly preserved area of DNA binding encoded with homeobox gens.

3 0
3 years ago
In acculturation, subordinate groups will often incorporate new cultural elements into their own culture, creating a blend of ol
Elenna [48]

Answer:

The question is incomplete and should be:

In acculturation, subordinate groups will often incorporate new cultural elements into their own culture, creating a blend of old and new. A reinterpretation of new cultural elements to fit them with already existing traditions is called:___________

a.innovation.

b.syncretism.

c.assimilation.

d.acculturation.

e.modernization.

THE ANSWER IS B (SYNCRETISM)

Syncretism is a merging of different beliefs, cultures, school of thoughts or philosophies

5 0
2 years ago
I need to know the hypothesized enzyme
worty [1.4K]

Answer:

Hypotheis:

<em>If high amounts of product in the samples, '+++' , correlates with optimal temperatures and pH for enzyme activity, then...</em>

  • <u>A- Pepsin</u>
  • <u>B- Amylase </u>
  • <u> C- thermophilic enzyme</u>

Explanation:

Enzymes are specialized proteins that function as biological catalysts- <u>they speed up chemical reactions.</u> As proteins, these are susceptible to changes in temperature and pH- they function best at optimal values for both conditions, but can be denatured, rendering them inactive at relative extremes.

Each enzyme provided has its own optimal temperature and pH values.

  • Thermophilic enzymes are usually found in regions characterized by high temperatures. They show high thermostability, and do not become denatured at high temperatures- they thrive, and do not function well at lower temperatures.
  • Amylase is a hydrolase digestive enzyme found in the mouth, that acts on polysaccharides like starch to break 1,4  glycosidic bonds between glucose molecules. It works best at a physiological (neutral) pH and temperatures (around 37°)
  • Pepsin, another digestive enzyme, is a peptidase that breaks down proteins into peptide molecules. It is found in the stomach lining, where the pH  is typically low i.e. acidic due to the hydrochloric acid in digestive juices.

Thus from the table A- pepsin, B- Amylase and C- thermophilic enzyme can be hypothesized.

6 0
2 years ago
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