BIOLOGY MIDDLE SCHOOL

Where does the dna in our cells come from

Answers

Answer 1
Answer:

Answer:

Where does the dna in our cells come from? it comes through inheritance from parents

Explanation:

Every living organism has its genetic make-up which is located in the DNA and resides in the nucleus of a cell. DNA is unique to an individual without having a similar or carbon copy, it is inherited from the parents.


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HIGH SCHOOL

Which of these is the BEST way to rewrite the sentence in line 29? A) In America during the late 1800s and early 1900s, many intolerant people who mistreated African Americans. B) In America during the late 1800s and early 1900s, many intolerant people mistreated African Americans. C) In America during the late 1800s and early 1900s, many people because they were intolerant. D) In America during the late 1800s and early 1900s, many people who were very intolerant.

Answers

Answer:

B is the most logical answer, the other sentences have many gramatical errors

HIGH SCHOOL

The _____ passively diffuses oxygen and carbon dioxide in and out of the cell.

Answers

The _____ passively diffuses oxygen and carbon dioxide in and out of the cell.Through the plasma membrane, oxygen and carbon dioxide diffuses passively.
However, it is thru a transport that they in act to diffuse, -concentration gradient. 
HIGH SCHOOL

Describe and explain the importance of a water potential gradient in the uptake of water by plants.

Answers

The water potential in a plant regulates if the plant cell is either turgid or plasmolysed. If the environment has a higher water content than the plant, the plant would take in water through osmosis. If the cell has enough water, it becomes turgid. The cell walls avoids the bursting of plant cells.
HIGH SCHOOL

In a plant's life cycle, the diploid stage is known as . N phase. B. the sporophyte. C. alternation of generations. D. the gametophyte. Reset Selection

Answers

Answer:

B. the sporophyte.

Explanation:

Plants employ the phenomenon of ALTERNATION OF GENERATIONS in their life cycle i.e. they alternate between a diploid state and haploid state. This diploid state (2n) of a plant is called SPOROPHYTE. The sporophyte is the dominant form of a plant's life cycle. The

diploid sporophyticc body of a plant produces haploid spores via meiotic division.

These haploid spores germinates to form the haploid state of the plant called GAMETOPHYTE. The GAMETOPHYTE is responsible for producing the haploid gametes (sperm and egg) that fuses to form a diploid ZYGOTE (2n) which eventually grows and develop into the diploid SPOROPHYTE. The cycle repeats in that manner.

In plants life cycle, the diploid stage is known as B. The sporophyte.
HIGH SCHOOL

Water is considered a polar molecule because _____. it has partial positive and negative charges at each end
it expands when it freezes
it dissolves solutes

Answers

Answer: Option (a) is the correct answer.

Explanation:

A water molecule contains two hydrogen atoms and one oxygen atom. The chemical formula of water is .

Here, hydrogen is electropositive whereas oxygen atom is electronegative in nature. Hence, oxygen atom pulls electrons from hydrogen atom and as a result partial positive charge develops on hydrogen and partial negative charge develops on oxygen atom.

Therefore, molecule of water becomes polar in nature.

Thus, water is considered a polar molecule because it has partial positive and negative charges at each end.

Answer:

The answer is It has partial positive and negative charges at each end.

Explanation:

When a neutral molecule has a positive area at one end and a negative area at the other, it is a polar molecule. Water is a polar molecule, because there is an irregular distribution of electron density in it. This means that water has a negative partial charge near the oxygen atom and a positive partial charge near hydrogen atoms.

HIGH SCHOOL

A ____ is a characteristic arising from genes located on gender- determining chromosomes

Answers

A sex-linked trait is a characteristic arising from genes located on gender-determining chromosomes.

Answer:

autosomal trait

Explanation:

just did it on study island

HIGH SCHOOL

Which of the following is an important, life-sustaining property of water? ability to moderate temperature
versatility as a solvent
expansion upon freezing
cohesive behavior
contraction upon freezing

Answers

Answer: versatility as a solvent

Water is called as an universal solvent because it is capable of dissolving variety of substances within it than any other type of liquid. It is important component of all the life forms present on the planet earth. The water provides a medium for the dissolution of minerals and nutrients necessary for cellular metabolism, and growth in all life forms. It allows the transportation of the gases, hormones, and other substances to all the parts of the living organisms.

     

Answer:

 expansion upon freezing

 versatility as a solvent

 cohesive behavior

 ability to moderate temperature

Explanation:

Water has special properties that contribute to Earth's suitability as an environment for life. These properties include, but are not limited to:

cohesive behavior

ability to moderate temperature

expansion upon freezing, and

versatility as a solvent.

Cohesion is the attraction of water molecules to other molecules through hydrogen bonding. This behavior allows water to be transported upward against gravity in the roots and stems of plants.

Water is known for its ability to moderate temperature. Water heats up slowly and cools down slowly. This property helps stabilize temperatures in areas near bodies of water because water can absorb heat during the day and release heat during the night.

During the winter, large bodies of water such as lakes do not freeze solid because water expands when it freezes to form ice. The ice floats to the surface, forming an insulating layer that keeps the liquid water below from freezing. If water contracted upon freezing, ice would sink to bottom of large bodies of water, allowing the rest of the water in them to freeze, too. As a result, most aquatic organisms would die.

Water is known as a versatile solvent because it is a polar molecule and can dissolve other polar molecules with ease. Many of the nutrients and other substances required for life must be dissolved in water before they can enter cells, and almost all of the chemical reactions necessary for life occur in solutions of water.

HIGH SCHOOL

How are mutations prevented during dna replication?

Answers

DNA polymerase checks DNA for errors. DNA polymerase checks DNA for errors by breaking the hydrogen bonds between the paired nitrogen bases in the DNA molecule. This causes the molecule to separate into two individual strands.

Answer:

By proofreading activity of DNA polymerase.

Explanation:

Mutations are defined as permanent, inherited changes in the nucleotide sequence of genetic material. Mutations can be caused by errors during the DNA replication, when the enzyme DNA polymerase adds a wrong nucleotide to the growing DNA strand.

When a wrong nucleotide or base is detected (by proof-reading activity of DNA polymerase) in the growing chain, DNA replications halts and the incorrect base is removed by the enzyme's exonuclease activity. Then, DNA polymerase again starts to replicate the DNA, using its polymerizing activity.

Thus, the errors can be prevented during DNA replication by DNA polymerase as it shows both polymerizing, exonuclease and as well as proof-reading activity.

HIGH SCHOOL

Mutations can occur in the chromosomes of all types of cells. Mutations that are passed on to offspring must occur in A) gametes. B) body cells. C) stem cells. D) somatic cells. Submit

Answers

Its A) Gametes. Hope this helps ;)
Correct answer would be d somatic cells
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