BIOLOGY HIGH SCHOOL

The microorganisms present on day 5 were (1) newly added from the sterile culture medium
(2) offspring of antibiotic-resistant individuals
(3) organisms that were all present on day 1
(4) offspring with no resistance to the antibiotic

Answers

Answer 1
Answer: The microorganisms present on day 5 were "(4) offspring with no resistance to the antibiotic" since antibiotics would have eliminated an unfit contenders. 

Related Questions

HIGH SCHOOL

Which statement best describes the difference between the sympathetic and parasympathetic nervous systems? A. The sympathetic system sends signals within the brain and the parasympathetic system sends signals between the brain and the body. B. The sympathetic system prepares the body for stress and activity and the parasympathetic system prepares the body for rest. C. The sympathetic system controls voluntary body movements and the parasympathetic system controls involuntary functions. D. The sympathetic system contains the brain and spinal cord and the parasympathetic system contains the peripheral nerves.

Answers

The correct answer is option B, that is, the sympathetic system prepares the body for stress and activity and the parasympathetic system prepares the body for rest.  

Both the parasympathetic and sympathetic nervous system are the components of the autonomic nervous system that works obligatorily. The sympathetic nervous system holds the key in controlling the body at the time of stress and injury, it is generally regarded as fight or flight. It contracts the muscles of the heart in order to enhance the rate of the heart.  

On the other hand, the parasympathetic nervous system is responsible to monitor the function of the body when it is at rest. It assists in sustaining the homeostasis in the body. It relaxes the muscles of the heart in order to reduce the rate of the heart.  


Answer:

The answer is option B.

Explanation:

Both the parasympathetic and thoughtful sensory system are the segments of the autonomic sensory system that works compulsorily. The thoughtful sensory system holds the key in controlling the body at the season of pressure and damage, it is by and large viewed as battle or flight. It gets the muscles of the heart with the end goal to improve the rate of the heart.  Then again, the parasympathetic sensory system is mindful to screen the capacity of the body when it is very still. It helps with maintaining the homeostasis in the body. It loosens up the muscles of the heart with the end goal to diminish the rate of the heart.

COLLEGE

Why is variation essential for evolution

Answers

It is essential for everyday life
HIGH SCHOOL

All of the following patterns were witnessed by Darwin except that species vary A. within very short spans of time.
B. over time.
C. around the world.
D. locally.

Answers

A. within very short spans of time. 

The natural selection process ensures that the weak members or traits of organisms are removed so that only the strong will remain. This ensures that the organisms and their descendants will live for as long as possible. This is the process by which organisms evolve to allow for higher survival rates. For example, an animal that is covered by thick and multiple layers of fur is made for the extremely cold climates. However, if the world begins to get warmer and warmer, such animals and their offspring will begin to have thinner and thinner layers of fur. This will allow their specie to survive longer. 
The correct answer is letter A.

Darwin observed all of the other choices in evolution except letter A. Evolution does not occur in very short spans of time but rather the opposite. Evolution in environments occurs in long periods of time where species develop certain behavioral and physical adaptations to help them thrive and survive.
MIDDLE SCHOOL

In the prophase of mitosis, which of the following occurs? A. The chromosomes uncoil to form chromatin. B. The chromosomes coil into structures called genes. C. The genes uncoil to form chromatin. D. The chromatin coils and condenses into visible chromosomes.

Answers

D. The chromatin coils and condenses into visible chromosomes.

is the correct answer....

HOPE IT HELPS YOU '_'
In prophase of mitosis, the genes → chromatin (DNA + protein) are uncoiled, so they are visible. This makes the chromatin into chromosomes, thin, spindle-like things. These are what we usually correlate with genes and can see. This supports option D, which is your answer.
HIGH SCHOOL

Of the 23 pairs of human chromosomes, 22 pairs are homologous and are found in both males and females. these are called ________.

Answers

The answer is:  "autosomes" .
____________________________________________________________
         Of the 23 pairs of human chromosomes, 22 pairs are homologous and are found in both males and females.  These are called  autosomes .
____________________________________________________________ 
HIGH SCHOOL

Which of the following statements is FALSE? A. Reducing agents like BME affect tertiary structure, but not quaternary structure. B.A change in protein primary structure may affect quaternary structure. C.Increasing or decreasing pH does not affect primary structure.D. Secondary structure is completely disrupted by treating a protein with urea.

Answers

Answer:

Increasing or decreasing pH does not affect primary structure.

Explanation:

Proteins may be defined as the polymers of the amino acids and are bonded together through the peptide bond. The proteins folding includes the primary structure, secondary, tertiary structure and Quaternary structure.

The complete denaturation of the primary structure of protein results in the permanent loss of the biological activity. The physical conditions like temperature, pH affects the primary structure of proteins. The high or low pH may results in the loss or gains of the ions and affects the primary structure of protein.

Thus, the correct answer is option (C).

MIDDLE SCHOOL

Who/What ends a food chain?

Answers

Answer

decomposers end the food chain but technically the food chain never stops

The food chain never ends but a decomposer ends the food chain
MIDDLE SCHOOL

Is the following sentence true or false? It is easier to synthesize new elements with very large atomic numbers.

Answers

Answer (True/False):FALSEExplanation:

Atomic number defines the number of electrons and protons in an atom. where as synthesizes means to produce something chemically. Keeping both the statements in view, it is not easier to synthesize new elements with a large number of electrons and protons. Though this process can be done for the small atomic numbers.

No, not particularly. For those beyond a certain point, you actually need to create the precursors first and then combine them again.
MIDDLE SCHOOL

The Greeks assigned what magnitude to the brightest star seen the night sky? 1

Answers

Answer:

The Greeks attributed magnitude 1 to the brightest star seen in the night sky.

Explanation:

The Greeks created a system of magnitude based on the brightness of stars in the northern sky. It is not known for sure which astronomer was responsible for this, although many believe Hipparchus or Alexander Ptolemy is the creator.

These magnitude systems related the star's apparent brightness to its actual size. That way the brighter the star appeared in the night sky, the bigger its real size would be. For the brightest stars, magnitude 1 was associated.

On the modern magnitude scale, Sirius, the star with the brightest apparent magnitude, has been assigned a magnitude of −1.5.

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