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3 years ago

In the Northern Hemisphere, the summer solstice occurs on ____.

Biology

2 answers:

GaryK [48]3 years ago

5 0

Answer:

A. June 20 or 21

Explanation:

In the Northern Hemisphere the summer solstice occurs on June 20 or 21 and the winter solstice on December 21 or 22. The situation is exactly... At the summer solstice, the Sun travels the longest path through the sky, and that day therefore has the most daylight.

Musya8 [376]3 years ago

4 0

A. June 20 or 21

It’s the answer that I remember when I did this

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ATP produces ____ to drive chemical reactions for the cell

cluponka [151]

Answer:

Energy

Explanation:

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4 years ago

How population sizes in nature are regulated

Lady_Fox [76]

Answer:

The density of a population can be regulated by various factors, including biotic and abiotic factors and population size. Density-dependent regulation can be affected by factors that affect birth and death rates such as competition and predation.

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3 years ago

Read 2 more answers

Butter and oil are examples of food composed of

exis [7]

Answer:

lipids

Explanation:

-Lipids are among the four biomolecules the others being proteins, carbohydrates and nucleic acids. Lipids are made of fatty acids and glycerol. --Fats (solid) and oils (liquid) are the major types of lipids.

-Butter is an example of saturated fats while oils are the lipids in liquid form.

7 0

3 years ago

Learning Task 2 Write the word true or false if the statement is correct and if false change the underline word or words to make

EastWind [94]

Complete question:

Write the word TRUE if the statement is correct and if FALSE change the underlined word or words to make the statement correct.

_______1. A molecular group consisting of a sugar molecule, a phosphate group and a nitrogenous base is a nucleic acid.

_______ 2. In a DNA molecule, a base pair would be composed of adenine and guanine.

_______ 3. Cytosine and adenine are purines.

_______ 4. During the replication of DNA, bonds are broken between the phosphate groups.

_______ 5. RNA contains the nitrogenous base uracil.

_______ 6. There are 20 different amino acids in a cell.

_______ 7. The coded message carried by messenger RNA is translated into polypeptides at organelles called chloroplasts.

_______ 8. The decoding of a messenger RNA message into a polypeptide chain is known as translation

_______ 9. A severe mutation may lead to cell death and may have no effect on the body.

_______ 10. Most mutation are harmful.

Answer:

False
False
False
False
True
True
False
True
True
False

Explanation:

_False_1. A molecular group consisting of a sugar molecule, a phosphate group, and a nitrogenous base is a nucleic acid.

Nucleotides: subunits or monomers composed of a sugar molecule, joined with a phosphate group and a nitrogenated base. The chain or sequence of nucleotides composes the polymer. Different nucleotides joined by their extremes compose the nucleic acid: DNA or RNA.

A molecular group consisting of a sugar molecule, a phosphate group, and a nitrogenous base is a nucleotide.

_False_ 2. In a DNA molecule, a base pair would be composed of adenine and guanine.

In the DNA molecule, Adenine (Purine) always pairs with Timine (Pyrimidine), while Guanine (Purin) pairs with Cytosine. A-T pair is united by 2 hydrogen bonds, and the G-C pair is united by 3 hydrogen bonds.

In a DNA molecule, a base pair would be composed of adenine and timine, or In a DNA molecule, a base pair would be composed of cytosine and guanine.

_False_ 3. Cytosine and adenine are purines.

Nitrogenated bases that form nucleic acids correspond to purines and pyrimidines. Adenine and guanine derive from purines, while Thymine and Citocine derive from Pyrimidines.

Guanine and adenine are purines.

_False_ 4. During the replication of DNA, bonds are broken between the phosphate groups.

During the replication of DNA, bonds are broken between the hydrogen groups.

_True_ 5. RNA contains the nitrogenous base uracil.

Instead of Timine, RNA contains uracil that pairs with adenine.

_True_ 6. There are 20 different amino acids in a cell.

_False_ 7. The coded message carried by messenger RNA is translated into polypeptides at organelles called chloroplasts.

When mRNA leaves the nucleus, meets a free ribosome in the cytosol. Into this organelle, it starts the protein building. Ribosomes read the mRNA code and begin protein synthesis by adding the correct amino acid using transference RNA.

The coded message carried by messenger RNA is translated into polypeptides at organelles called ribosomes.

__True__ 8. The decoding of a messenger RNA message into a polypeptide chain is known as translation

__True__ 9. A severe mutation may lead to cell death and may have no effect on the body.

_False_ 10. Most mutation are harmful.

A mutation is a change or alteration in DNI sequences that introduce new variants. Many of these are eliminated, but most of them might succeed and be incorporated into each individual. These mutations are the ones that have been selected by natural selection, leading to evolution.

Most mutation are not harmful

5 0

3 years ago

The egyptian plover is a bird best known for its symbiotic relationship with what host animal?

EastWind [94]

Answer:

Nile crocodile

Explanation:

The Egyptian plover is a small bird with a very unusual friend in the animal kingdom. This bird actually has a symbiotic relationship with the Nile crocodile. It may seem very odd relationship, but it is one that works excellently for both sides. The crocodiles have sharp set of teeth, but they have spaces between them and can not move their jaws sideways. Because of this, very often there's meat stuck between the teeth of the crocodiles, and this is when the Egyptian plover comes on the scene. This little bird actually gets into the open mouth of the crocodiles, picking up the pieces of meat that have stuck between their teeth, and then continuing with its mission. The crocodiles do not try to eat this bird, but instead they stand still while it does its job. The relationship is beneficial for both sides, as the crocodiles have their own personal ''dentist'', while the plover gets free food.

5 0

3 years ago