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Dahasolnce [82]
3 years ago
7

How are the DNA strands organized

Biology
1 answer:
nirvana33 [79]3 years ago
5 0

Answer:

They are all composed of building blocks called nucleotides that are linked together in a row. its two complementary strands are chemically linked together and are spiraling around counterclockwise, forming a ladder-like double-stranded molecule.

Explanation:

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List one advantage and one disadvantage of asexual reproduction.
Rom4ik [11]

Answer:

See Below

Explanation:

Advantage: Offspring produced will share the characteristic of their parent identically (No need for partnership)

Disadvantage: Limits evolutionary process

5 0
4 years ago
The absence of which of these will not affect photosynthesis is - oxygen, Carbon dioxide, water, Chlorophyll, light. Give reason
In-s [12.5K]

Answer:

Oxygen

Explanation:

Oxygen is the by product of photolysis during photosynthesis whereby water molecules are split to form protons (H+ ions), electrons and oxygen (by product).

Oxygen is not needed during any of the reactions in photosynthesis and Calvin cycle and will not affect the rate of photosynthesis or possibility of photosynthesis occurring. However, it will affect the process of aerobic respiration instead.

Carbon dioxide is needed in carbon fixation during the Calvin cycle. Without it, 6 carbon sugars cannot be formed.

Water is needed for photolysis to produce protons (maintain the electrochemical gradient) and electrons (to replenish lost electrons)

Chlorophyll are pigments that harvest light energy to excite electrons produced from photolysis of water to be passed down the electron transport chain.

Light is needed as a source of energy to energise the electrons

5 0
3 years ago
Definition: This is showing possible outcomes, genotypes and phenotypes, of offspring from two parents,
NikAS [45]

A <u>Genetic cross</u> shows the possible outcomes, genotypes and phenotypes of offspring from two parents, and usually shown using a Punett Square.

Explanation:

 A genetic cross is the resultant progeny that carries the genetic trait of each parent and obtained by crossbreeding of two organisms by mating them.

The two types of genetic crosses are – monohybrid (a single trait from each parent is crossed) and dihybrid (two traits are crossed) cross.

The organisms which are crossed can be with either be heterozygous (Rr) or homozygous (rr) alleles representing a trait; traits are either dominant (R) or recessive (r); the combination of genes for a particular trait results in a genotype (Rr); the resultant physical feature formed from the genotype is the phenotype.

The resultant crosses which can be obtained with the possible genotype and phenotypes are evaluated based on probability equations on the likelihood of possible specific offsprings to be formed due to the crossbreeding and according to the laws of genetics and Mendelian Inheritance. The results of the crossing are visually represented using a Punnet Square. The Punnet Square tabulates and summarizes all resultant probabilities from all possible combinations of maternal and paternal alleles.

5 0
3 years ago
What characteristic of amphibians necessitates that they live near water?
Alinara [238K]
They are mostly habittated to watter because they requres oxygen more from water or there organ setup to do it works properly under water.
5 0
4 years ago
true or false during the process of osmosis when the concentration of water inside the cell is greater than outside of the cell
Readme [11.4K]

Answer: False

Explanation: Water would flow out of the cell because water moves down the concentration gradient (moves from high to low).

5 0
4 years ago
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