BIOLOGY HIGH SCHOOL

Bats Devastated by Deadly FungusThe most common bat species in North America, the little brown bat, could be facing
extinction because of a fungus. The fungus, called white-nose syndrome, grows on the
exposed skin of bats as they hibernate in cool caves or mines. Infected bats develop lesions
(sores) on their wings, which play important roles in water balance, circulation and heat regulation.
These lesions on a bat’s wings or on its nose cause the bat to wake up during hibernation.
Waking up early forces the bat to use up the energy it has stored as fat for its long
sleep, exhausting the animal and eventually killing it.
In some infected caves, 90 percent to 100 percent of bats die. On average, the disease
takes out 73 percent of the bat population at a given hibernation site. If infection continues
at current rates, the researchers predict that the little brown bat population will drop below
0.01 percent of its current numbers by 2026.
The loss of the little brown bat would be harmful for humans because bats eat their
body weight in insects each night. Many of these bugs are agricultural pests or carriers of
human disease.
One way to decrease the spread of the disease would be for the researchers who visit
infected caves to decontaminate their clothes and gear with antiseptics. It has also been suggested
that a small number of these bats could be placed in an artificial hibernating area
and medicated to protect them.

Describe one way that an infection with the white-nose fungus can cause death in little brown bats.

Answers

Answer 1
Answer: Infected bats develop lesions
(sores) on their wings, which play important roles in water balance, circulation and heat regulation.
These lesions on a bat’s wings or on its nose cause the bat to wake up during hibernation.
Waking up early forces the bat to use up the energy it has stored as fat for its long
sleep, exhausting the animal and eventually killing it.
In some infected caves, 90 percent to 100 percent of bats die. On average, the disease

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A lack of Vitamin D is said to be detrimental to the maintenance of bone density. If a scientist wanted to determine whether this view was supported by scientific evidence,
which of the following would be the best method of doing so?
(a) carry out a survey of people with normal bone density to find out whether they
take Vitamin D tablets or not
(b) compare the bone density of two groups of people with low bone density after
providing only one of the groups with Vitamin D
(c) compare the incidence of people with low bone density in two different populations
(d) carry out an experiment in which a group of people with normal bone density are
exposed to very little sunlight to prevent the production of Vitamin D

Answers

i would do B because then you can compare people who do take Vitamin D to people who don't and then you can see who has better bones and the effects. 
D is also a good option because when their little production of vitamin D we can easily determine what is the effect of this experiment to the bone density...

When bonds are broken, energy is released.
True or false

Answers

Answer:

False. When bonds are broken, energy is absorbed.

Explanation:

Atoms form bonds to seek stability, which means lower energy compared to when they were separated. This means that separating atoms by breaking bonds is not energetically favourable.

Therefore, in order to break a chemical bond we need to provide energy to the system, which makes the process endothermic (it absorbes energy).

The attached image shows an energy diagram for the H₂ molecule, showing the variation in energy during bond formation.
False. Breaking Bonds → Energy Absorbed

You have to put energy into a molecule to break its chemical bonds. The amount needed is called the bond energy. If you think about it, molecules don't spontaneously break.

The strong attraction between water molecules is called—-A-cohesion
B-Magnetism
C-Electricity
D-Polarity

Answers

Answer:

Cohesion

Explanation:
cohesionnnnnmnnnnnn nnnnnxndndjdjdjdjd

what causes a protein to migrate on SDS-PAGE in such a way that it appears to be a protein that is much bigger

Answers

SDS-PAGE is used for separation of proteins or protein fragments based on their size. SDS is an ionic detergent that denatures and binds to proteins. Consequently, the proteins are negatively charged. An electric current is running through the gel in the electrophoresis with positive pole on the bottom. Since proteins are negatively charged, they migrate toward the positive pole of the gel. Some of the proteins are smaller so they can travel more quickly through the gel than the bigger proteins. 

Which statement best explains why water is known as the universal solvent?

Answers

It is known as a universal solvent because of the vast number of compounds that dissolve in water completely. This however goes for destilated water which has been cleansed from all waste and the water has been purified to be pure H2O. This means there's no metals or trace compounds inside.

Answer:

B is the answer

Explanation:

In the 1950s, when watson and crick were working on their model of dna, which concepts were well accepted by the scientific community?

Answers

Watson and Crick describe structure of DNA 1953 Photo: Model of DNA molecule In the late nineteenth century, a German biochemist found the nucleic acids, long-chain polymers of nucleotides, were made up of sugar, phosphoric acid, and several nitrogen-containing bases. In 1950, biochemist Erwin Chargaff found that the arrangement of nitrogen bases in DNA varied widely, but the amount of certain bases always occurred in a one-to-one ratio. 
Watson and Crick took a crucial conceptual step, suggesting the molecule was made of two chains of nucleotides, each in a helix as Franklin had found, but one going up and the other going down. 
Watson and Crick showed that each strand of the DNA molecule was a template for the other. 

In the 1950s, Both Watson and Crick were working on the composition of DNA, that is, the molecule that comprises the hereditary information for cells. The discovery of the double-helix, and the twisted ladder composition of DNA, by Watson and Crick, signified a landmark in the field of science and paved the path for the origination of modern molecular biology.  

However, when Watson and Crick were working on DNA model, some of the concepts were well accepted by the scientific community like the chromosomes are formed of nucleic acid and protein, chromosomes are found in the nucleus, and genes are located on the chromosomes.  
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