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3 years ago

The suns energy drives which of the following processes?

1 answer:

7 0

The sun's energy drives various processes on earth. One of these processes is photosynthesis in plants whereby light energy is converted into chemical energy by forming carbohydrates from carbon dioxide plus water, which is a process which usually gives off oxygen which animals need to breathe. Another process driven by the sun's energy could be evaporation of water into the air to form water vapour and clouds which then precipitate when cooled off over mountains so is involved in the water cycle.

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During the process of mammalian fertilization, a sperm cell encounters glycoproteins in the gelatinous extracellular matrix that

LiRa [457]

Answer:

Carbohydrates, particularly glycoproteins act as ligands for cell surface receptors.

Explanation:

Glycoproteins

Glyproteins are conjugate molecules comprising of carbohydrates conjugated with proteins.
Glycoproteins play a vital role in cell-cell recognition, pathogen recognition and and cell adhesion.
Glycoproteins on the surface of pathogens act as prominent antigens for the immune system.

Glycoproteins in Fertilization:

Several glycoproteins are attached to the surface of the zona pellucida, the envelope of the oocyte. In humans, these have been termed as ZP1-4.

Glycoprotein-sperm interaction is one of the most crucial steps in fertilization. This receptor-ligand interaction ensures the entry of the sperm into the zona pellucida, the extracellular coat, covered in glycoproteins that surrounds the oocyte or egg.

Carbohydrate binding proteins present on the surface of the sperm recognize the glycoproteins on the zona pellucida (ZP). This enables them to adhere to the surface of the ZP and also to gain access to the oocyte.

3 0

3 years ago

Like gymnosperms, many grasses and angiosperm trees are wind-pollinated. To conserve energy, these angiosperms do not produce co

lutik1710 [3]

Answer:

C. petals

Explanation:

A)fruits

B)sepals

C)petals

D)anthers

E)ovaries

The part that will not be necessary in wind pollinated angiosperm is the petals .

The petal is a part of flower that is usually colorful and primarily function by attaracting insect pollinators to the flower.

Since wind pollinated angiosperms do not need to attract insect for pollination, they do not need the colorful petals. They rely on wind to carry their pollen from their anthers to their stigmas (pollination).

Hence, the correct option is C.

6 0

3 years ago

What feature connects an island to the mainland or to another island

kogti [31]

Landscape ...... music...

8 0

3 years ago

What is the difference between parasite and host

kaheart [24]

A parasite is the one who feeds on the host and the host is the one who has to deal with the parasite. basically a parasite feeds on a animal or being so i can survive

7 0

4 years ago

Mitosis and meiosis always differ in regard to the presence of a. chromatids. b. homologs. c. bivalents. d. centromeres. e. spin

Fantom [35]

Answer:

c. bivalents.

Explanation:

In Meiosis a bivalents are formed during the first stage of meiosis which is the prophase. The bivalent consist of a paired chromosome and four chromatids i.e two chromosomes in a tetrad. one chromosome comes from each parent.

In mitosis, a bivalent is not formed. There is the presence of chromatids, homologs, centromeres and spindles during mitosis and meiosis.

5 0

3 years ago

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