BIOLOGY HIGH SCHOOL

What type of fertilization requires a great excess of egg and sperm gametes because most are wasted? a.external fertilization
b.internal fertilization
c.pollination

Answers

Answer 1
Answer: b.internal fertilization

Sexual reproduction provides genetic variation because the sperm and egg that are produced contain different combinations of genes than the parent organism.  Sexual reproduction involves meiosis which is the process of a cell doubling its DNA, shuffling its genes and then dividing the shuffled DNA among four cells.Each resulting cell, or gamete from meiosis has only half the amount of DNA as the parent cell. So in order to form a new organism, two gametes, sperm and egg, must fuse, further mixing the genes to produce more genetic variation.
Answer 2
Answer:

just wanted to let you all know that the answer isnt b..... chose that and got it wrong. have a good day yall!

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After meiosis there area. two haploid cells. b. two haploid gametes. c. four haploid cells. d. four haploid gametes.
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Use your understanding of the phosphorus cycle to answer the questions provided.Phosphorus cycles between living things and the ______. ?

Answers

Phosphorus cycles between living things and the SOIL

Explanation:

Phosphorus flows in a cycle within rocks, water, soil and sediments, and organisms. The phosphorus cycle is the biogeochemical cycle that represents the action of phosphorus within the lithosphere, hydrosphere, and biosphere. Phosphorus is an essential element for all sorts of life. As phosphate (PO4), it delivers up an essential part of the structural core that holds DNA and RNA mutually.
Phosphorus cycles between living things and the environment, particularly the soil. This is the case with many other substances as well such as carbon. The cycling occurs due to the action of organisms which uptake and release phosphorus into the soil. Phosphorus exists in animals in many forms, particularly in the ATP molecule. When the animal dies, its remains are decomposed and the constituent ions are released into the soil, after which they are taken up by plants. Animals consuming these plants gain the phosphorus again, and the cycle continues.

What happens during anaerobic cellular respiration?

Answers

During aerobic respiration, the cells still need to release energy without oxygen. therefore, they directly split glucose to form lactic acid. this releases a lot less energy than aerobic respiration and the lactic acid accumulates in your muscles, causing aching. 

Answer:

In anaerobic respiration, one molecule of glucose is broken down into two molecules of ethanol (in yeast) or lactic acid (in muscle cells) with a net gain of two molecules of ATP (adenosine triphosphate).

Two molecules of carbon dioxide are released as the byproduct.

It helps in regenerating the NAD⁺ lost in the process of glycolysis.

The overall process is termed as fermentation.

Lactic acid fermentation is catalyzed by the enzyme lactate dehydrogenase and alcohol (ethanol) fermentation is a two-step process which is catalyzed by pyruvate decarboxylase and alcohol dehydrogenase.

Glaciers that cover large sections of entire continents or other large land masses are classified as _____.

Answers

They are classified as continental glaciers 
Ice sheets or Continental glaciers

Which of the following statements about physical models is not true?a. Physical models are often three-dimensional representations.
b. Physical models are used to represent an object or event.
c. Physical models are usually in the form of a graph.
d. Physical models can be used to depict microscopic objects

Answers

c. Physical models are usually in the form of a graph.

Physical models represent and display certain paradigms and theoretical representations of how one mechanism functions or what is the components that make up an object, for instance. Hence, these aid scientists and other learners to have an overview of that is currently on the process. 

Answer:

C. is the right one just took test

The alveoli are surrounded by __________ carrying blood to and from the heart.

Answers

The alveoli are surrounded by tiny blood vessels, called capillaries carrying blood to and from the heart.

The alveoli are surrounded by blood vessels carrying blood to and from the heart.

C) blood vessels

Hope this helped! :)

Fruit flies are eukaryotic organisms. Describe how the genetic material of a fruit fly is stored in its cells.

Answers

The genetic material of a fruit fly, like all eukaryotic organisms, is stored in the cell nucleus. Here's how it is organized:

1. **Nucleus:** The nucleus is a membrane-bound organelle within the cell where the genetic material is located. It is surrounded by a nuclear envelope, which consists of two membranes, and has pores that control the passage of molecules in and out.

2. **Chromosomes:** Inside the nucleus, the genetic material is organized into structures called chromosomes. In fruit flies (Drosophila melanogaster), they typically have four pairs of chromosomes, totaling eight chromosomes. These chromosomes contain the DNA molecules that carry the genes.

3. **DNA:** DNA (deoxyribonucleic acid) is the molecule that makes up the genetic material. It has a double-helix structure and consists of nucleotide units. Genes, which are specific sequences of DNA, encode the instructions for building and maintaining the organism.

4. **Histones:** DNA in the nucleus is wrapped around proteins called histones. This complex of DNA and histones is called chromatin. Histones help in packaging and organizing the long DNA strands within the limited space of the nucleus.

5. **Nucleolus:** Within the nucleus, there is a region called the nucleolus where ribosomal RNA (rRNA) is synthesized and ribosome assembly begins. Ribosomes are essential for protein synthesis.

6. **Mitochondria and Chloroplasts:** While most of the genetic material is in the nucleus, eukaryotic cells also have DNA in other organelles. Mitochondria (in animal cells) and chloroplasts (in plant cells) have their own small genomes, a remnant from their evolutionary origins as independent organisms.

In summary, the genetic material of a fruit fly is stored in the form of DNA, organized into chromosomes within the nucleus of its eukaryotic cells. This DNA contains the instructions for the fly's development, growth, and functioning.
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