BIOLOGY HIGH SCHOOL

A 911 call is made to police. Upon arrival to a crime scene, investigators discover the body. Instar I and Instar II maggots are found on the body. What was the approximate PMI of the victim? (Assume normal temperatures and conditions)

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In a active transport materials move from an area of ? Concentration and use ?
A "Pacemaker" can be external or internal and usually generates electrical stimuli to the heart muscle with ________:
Lateral roots that extend out are called taprootsfibrousadventitious roots.
What prevents antibiotics from being effective against viruses?A. Viruses have a high rate of mutation.B. Viruses have no RNA.C. Viruses have no metabolism.D. Viruses have a protein shell that protects them.

the plasma membrane allows some molecular species to enter and excludes others. it is therefore referred to as a ___ membrane?

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semi permeable membrane

A change in a sequence of DNA bases in a bacterial cell has resulted in a mutation. This mutation has increased the ability of the bacteria to break down and digest organic molecules in the environment. Bacteria with this mutation are better able to find and utilize food sources. According to the theory of natural selection, what is MOST likely to occur in future generations of this bacteria?A)The relative frequency of the mutation will increase as time passes.
B)Because the mutation has changed the DNA of the bacteria, a new species will be formed.
C)Because the mutation is abnormal, the mutation will become more rare with every passing generation.
D)Bacteria with the mutation will increase in number until the food supply is exhausted, causing the bacteria to become extinct.

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The answer is A) The relative frequency of the mutation will increase as time passes. 

In natural selection, genotype variations that will increase the chance of survival and reproduction of some organism are preserved and will be inherited. So, the mutation could not be abnormal, since it helps bacterial survival. Also, the bacteria will not extinct because of this mutation nor the new species will be formed since this is not so big mutation.
This leaves A) as the right answer. The relative frequency of the mutated allele will increase since the more bacteria with the mutation will survive and it will be passed down to the new generation over time.

Left thumb over right is dominant, and is represented with a capital C. Right thumb over left is recessive, and is represented with a lowercase c.What would be the genotype of a person who naturally crosses his right thumb over his left when folding his hands together?

A) cc

B) Cc

C) CC or cc

D) CC or Cc

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Answer: Option A) cc

Explanation:

  • For a given gene, there are 2 or more alternative forms present, and they are known as alleles.
  • The alleles are of two types - dominant and recessive.
  • The dominant allele is the one which expresses itself in both heterozygous and homozygous condition in the phenotype.
  • The recessive allele is the one which is only able to express itself in homozygous condition.
  • Since, the right thumb over left allele c is recessive, the person who crosses right thumb over left must be a homozygote, and hence his genotype should be cc.

The greenhouse effect is A. something that has occurred for millions of years. B. an unnatural phenomenon caused by humans that maintains Earth’s temperature range. C. the result of the differences in the angle of the sun’s rays. D. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere.

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B AN UNNATURAL PHENOMENON CAUSED BY HUMANS THAT MAINTAIN EARTHS TEMP RANGE

Its Not B its either c or d

A patient has diabetes, a disease that causes high blood sugar levels. Which macromolecule will a dietician monitor most closely in a patient that has the disease

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The answer is carbohydrate. The carbohydrate is consists of monosaccharides which includes sugar(glucose). So the carbohydrate will be a best dietician monitor.

The macromolecule that a dietician should monitor closely in a patient is : Carbohydrate

What are macromolecules ?

Macromolecules are molecules which are consisted of a large number of atoms. The macromolecule that the dietician should monitor closely is carbohydrates because carbohydrate consists of monosaccharides which includes sugar(glucose).

Hence we can conclude that The macromolecule that a dietician should monitor closely in a patient is : Carbohydrate

Learn more about Macromolecules : brainly.com/question/3680582

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In grafting, the plant with the root system is called the scion rootstock cutting, and the portion of the plant with the buds is called the rootstock scion cutting.

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In grafting, the plant with desired root system is called the rootstock, and the portion of the plant with the buds is called the scion.

The grafting is a horticultural technique in which parts from two or more plants are joined together to grow as a one single plant.
Rootstock is the plant selected for its roots because it can provide different properties, such as fruit size, or because it is resistant to drought or diseases. 
Scion is the plant selected for its leaves, flowers, fruits or stems.
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