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aleksandr82 [10.1K]
2 years ago
9

The features of alveoli for the efficient exchange of gases.

Biology
1 answer:
Nina [5.8K]2 years ago
4 0

Explanation:

The alveoli are lined with mucus and are surrounded by a network of blood capillaries. They have very thin walls for gases to be absorbed through. An individual air sac is called an alveolus. The layer of moisture in the alveoli allows gases to dissolve so that they can diffuse quickly.

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1pt Place the following steps in the correct order:
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Answer:

The delivery of the paternal genome to the egg is a primary goal of fertilization. In preparation for this step, the nucleus of the developing spermatozoon undergoes extensive morphological and biochemical transformations during spermatogenesis to yield a tightly compacted sperm nucleus. These modifications are essentially reversed during fertilization. As a result, the incorporated sperm nucleus undergoes many steps in the egg cytoplasm as it develops into a male pronucleus. The sperm nucleus (1) loses its nuclear envelope, (2) undergoes nucleoprotein remodeling, (3) decondenses and increases in size, (4) becomes more spherical, (5) acquires a new nuclear envelope, and (6) becomes functionally competent to synthesize DNA and RNA. These changes are coordinate with meiotic processing of the maternal chromatin, and often result in behaviors asynchronous with the maternal chromatin. For example, in eggs fertilized during meiosis, the sperm nucleus decondenses while the maternal chromatin remains condensed. A model is presented that suggests some reasons why this puzzling behavior exists. Defects in any of the processes attending male pronuclear development often result in infertility. New assisted reproductive technologies have been developed that ensure delivery of the sperm nucleus to the egg cytoplasm so that a healthy embryo is produced. An emerging challenge is to further characterize the molecular mechanisms that control sperm nuclear transformations and link these to causes of human infertility. Further understanding of this basic process promises to revolutionize our understanding of the mystery of the beginning of new life.

Explanation:

The delivery of the paternal genome to the egg is a primary goal of fertilization. In preparation for this step, the nucleus of the developing spermatozoon undergoes extensive morphological and biochemical transformations during spermatogenesis to yield a tightly compacted sperm nucleus. These modifications are essentially reversed during fertilization. As a result, the incorporated sperm nucleus undergoes many steps in the egg cytoplasm as it develops into a male pronucleus.

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5. The Skinner box allows experimenters to test animals without having to "re-load" the experiment, allowing the trainer to rein
Alekssandra [29.7K]

Answer:

  • The Skinner box allows experimenters to test animals without having to "re-load" the experiment, allowing the trainer to reinforce the animal with <u>operant conditioning</u> trials.

Explanation:

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3 years ago
A model of a specific event during meiosis is shown with various possible combinations. Which statement correctly cites evidence
Lynna [10]

Answer:

D) Chromosomes can align in metaphase I in multiple possible arrangements in a process called independent assortment.

Explanation:

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3 years ago
Read 2 more answers
Researchers noted that when a lysine residue on a histone is acetylated, its side chain becomes neutral in charge. Combined with
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Answer:

The correct answer is A) Histone deacetylation generally decreases gene expression.

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Histones are the proteins that are responsible for the condensation of chromatin, which is directly linked to the capacity that a gene has to be expressed. The more condensed a gene is, the less expressible it becomes.

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