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Airida [17]
3 years ago
5

Is a directional movement of ocean water​

Biology
1 answer:
taurus [48]3 years ago
4 0
A directional movement of water is ocean currents
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For fertilization to occur in humans, only one sperm is needed to weaken the barrier that surrounds the egg.
photoshop1234 [79]

Answer:

False

Explanation:

Approximately 200 out of 200 million sperms ejaculated during intercourse reach the general vicinity of the egg.  They sperms must undergo capacitation during which dilute inhibitory factors fluids of the female reproductive tract weaken the membrane of the sperm head so that head of the sperm can be broken easily when it came in contact with the egg.

The first sperm to reach an egg isn’t the one to fertilize it because the egg is surrounded by a gelatinous membrane called the zona pellucida. Outside this layer, a layer of small granulosa cells also present.

Therefore, it requires numerous sperm to clear a path through these barriers before one of them can penetrate the egg and fertilize it.

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The central dogma of molecular biology states that DNA is _______ into mRNA, which is then translated into polypeptides.
Gnom [1K]
1. transcribed

2. cytoplasm

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The cycads, a mostly tropical phylum of gymnosperms, evolved about 300 million years ago and were dominant forms during the age
Andrei [34K]

Answer:The Cycad tree is the sporophyte.They have flagellated sperm.

Explanation:

During pollination, the contents of the megaspore divide to form many–celled gamateophyte called the endosperm and archegonium. There is a micropyle opening with a sticky fluid, which traps the wind-borne male gametophyte (microspores) which,at this time is made up of prothallus cell;an antheridial cell and a large tube cell. The trapped microspore is sucked into the archegonia chamber. Antherizoids are released, but only one penetrates each oospore and fuses with the female nucleus. The zygote is formed in the ovule and the later develops into seed.The diploid seed germinates into a new sporophyte plant and the life cycle begins again. Examples of cycad include Cycas circinalis ,Cycas celebrical and Cycas revoluta

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Use the term "concentration" in a sentence about liquids that conveys its meaning. (9 points)
dimaraw [331]
The concentration of a liquid refers to how diluted or saturated the liquid is. This orange juice is so diluted it tastes like water.
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Why was using reverse transcriptase necessary for finding a way to make artificial insulin?
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A, scientists had to convert information from amino acids to nucleic acids.
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