Different lab safety rules should be followed, you should follow the written and verbal instructions, always try to do under direct supervision, never work alone in the laboratory.
What are the lab safety rules ?For lab safety rules we should be aware of hazardous materials, should be well trained before using any lab equipment, maintain the concentration to avoid either spillage of toxic chemicals.
All chemicals should be labelled and stored properly, do not mix up all the chemicals, Emergency plan should be placed, sensible clothes should be wear along with glasses, gloves and footwear.
Loose clothing do not get caught in a flame or chemicals, so it should be used, do not taste or smell chemicals, never pour old stock chemicals , Chemical Hygiene Plan (CHP) should be used which will addresses the specific hazards.
Do not follow un-tested and unauthorized experimental procedure, Never undertake unknown experimentation and clean up all the chemical spill.
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Which organelle houses and protects the DNA?
Answer:
Explanation:
The nucleus is surrounded by a membrane called the nuclear envelope, which protects the DNA and separates the nucleus from the rest of the cell.
Which of the following is true about chemical reactions?
A) Chemical reactions can create products (outputs) that are more complex than the reactants (inputs)
B) Chemical reactions involve changes in the energies of the molecules involved in the reaction
C) Organisms take in the matter and rearrange those atoms during chemical reactions.
D)Both A and B
E)All the Above
chemical reactions involve changes in the energies of the molecules involved in the reaction
During a chemical reaction, bonds are formed or breaked to make new products which may complex than the reactants. Energy changes can be happened in a reaction during rearrangement of atoms. Thus, all of the statements are correct.
What is a chemical reaction?
A chemical reaction is a chemical change occuring for matter where the atoms are regrouped into new products through bond making or bond breaking or both.
The change in energy during a reaction is called enthalpy change, where each reactant is associated with a standard energy and the energy may change with temperature or other external factor.
There may more than two reactants and some reactions are completing through several stages and may lead to complex products which are having entirely different properties from the reactants. Therefore, all the given statements about chemical reactions are correct.
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Which environmental factor controls the amount of sunlight that reaches underwater plants and animals?
_____________ controls the amount of sunlight that reaches underwater plants and animals.
Answer:
the abiotic factors
Explanation:
abiotic factors
Answer:
Water depth
controls the amount sunlight that reaches underwater plants and animals.
Explanation:
plato
Helppppppppp! Will give
The reactants in cellular respiration are the BLANK of photosynthesis and the products of cellular reparation are the BLANK.
Please fill in the blanks.
Help. During which phase of meiosis could an error result in trisomy and how?
А
Prophase l- an error during crossing over pulls an extra chromosome to one side of the cell
B
Metaphase 1- an error when spindle fibers attach results in an extra chromosome being created
Anaphase l- an error during random assortment pulls an extra chromosome to one side of the cell
D
Telophase l- an error when the nuclear membrane forms, it results in an extra chromosome being created
Answer: D
Explanation:
Just D.
What are the two factors that affect enzyme activity?
Answer:
temperature and concentration
Explanation:
I take biology
A hand sanitizer was advertised to be more effective at killing bacteria than any antibacterial soap. Students were split
evenly into 4 groups test this claim. Groups 1-3 washed their hands using the assigned hand sanitizer or soap (see
table) and warm water for two minutes, and then dried their hands with a paper towel. Group 4 rubbed their hands
vigorously for 2 minutes in warm water, without any soap or sanitizer, and then dried their hands with a paper towel.
After washing, each student’s hands were swabbed and the swab was applied to a culture plate and incubated. Finally,
the bacterial cultures were counted.
Treatment Bacteria Growth (# of bacteria)
Group 1: Hand sanitizer 28
Group 2: Soap A 12
Group 3: Soap B 13
Group 4: Warm water 24
A. What are the independent and dependent variables in this experiment?
B. Based on the claims of the hand sanitizer advertisement, what was the hypothesis for this experiment?
C. What is the control group?
D. What are 3 constants?
E. Based on the results in the data table, was the advertisement supported or refuted/rejected? Explain your answer.
Answer:
A) IV: Hand Sanitizer/Soap ; DV: #of bacteria
B) Hand Sanitizer is more effective in killing bacteria than Hand Soap.
C) Group 4 since they used neither product
D) Group 1, Group 2, and Group 3
E) The advertisement was rejected, because Hand Sanitizer was supposed to kill more bacteria, when in reality the Hand Soap did.
Explanation:
Hope this Helps!!
:D
What molecule provides short term energy
Answer:
ATP
Explanation:
it's a molecule called ATP (adenosine triphosphate)
Answer:
Carbohydrate is the answer
After a community is disrupted by a large-scale event, such as a forest fire, a new community is established through
which process?
a. climax succession
b. secondary succession
c. primary succession
d. soil formation
After a community is disrupted by a large-scale event, such as a forest fire, a new community is established through secondary succession The correct option is b.
What is secondary succession?Secondary succession occurs when a disturbance affects a climax or intermediate community. This restarts the succession cycle, but not all the way back to the beginning soil and nutrients are still present.
When the severity of a disturbance is insufficient to remove all of the existing vegetation and soil from a site, secondary succession occurs.
Secondary succession can be initiated by a variety of disturbances, including fire, flooding, windstorms, and human activities (for example, logging of forests).
Tropical forests gain structural complexity, taxonomic diversity, and functional diversity during secondary succession.
These changes result in the accumulation of carbon and nutrients in aboveground vegetation, as well as the creation of habitat for forest animal species.
Thus, the correct option is b.
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In humans the process of digestion begins in the mouth where food is chewed into small pieces by the teeth. The saliva helps by moving pieces these pieces around. These pieces are covered by bland,or spit. The saliva makes the food slippery so it's easier to blank.
Answer:
The saliva makes the food slippery so it's easier to SWALLOW.
Explanation:
Digestion of food begins from the mouth. When the food is chewed, it mixes with the saliva from the salivary gland and this makes the food slippery and easier to swallow. Once it is swallow it moved to pharynx to the oesophagus and down to the stomach where the stomach acid act on it. From there enzymes from the pancreases act on it to break it down and it is moved down to the small intestine where it is absorbed as nutrients and the undigested one move to the large intestine and form faeces.
HELP!!!! Due in 1 hour.
Answer:
1- A
2- B
3- D
4- C
Should be right
Explanation:
How is our genetic material determined? Explain using what you know about heredity.
DNA, deoxyribonucleic acid, is the genetic material in your cells. It was passed on to you from your parents and determines your characteristics. The discovery that DNA is the genetic material was another important milestone in molecular biology
Heredity, also called inheritance or biological inheritance, is the passing on of traits from parents to their offspring; either through asexual reproduction or sexual reproduction, the offspring cells or organisms acquire the genetic information of their parents
imagine you were collecting vegetation samples in an area to study their distribution over that area. describe how remote sensing images, maps, and GPS and gis could be helpful
Answer:
GPS and GIS help in data collection and guide about geographical distribution.
Explanation:
A GIS is a computer-based, system that aids in data collection, manipulation, and analysis. A GPS is a location tracking system that aids as a map-making tool. Remote sensing is remotely taking pictures of the landscape and physical features of the earth in order to be used for mapping the area. All these act as tools in map making and help to identify the location and map out the distribution of particular phenomenon on the surface of the earth. These tools will act as a guide for collecting vegetation samples.describe hematopoietic stem cells in your own words
Answer:
Hematopoietic stem cells (HSCs) are the stem cells that give rise to other blood cells. This process is called haematopoiesis. This process occurs in the red bone marrow, in the core of most bones. In embryonic development, the red bone marrow is derived from the layer of the embryo called the mesoderm.
Explanation:
Function: Stem cells that give rise to other blood ...
Location: Bone marrow
System: Hematopoietic system
The list includes six situations.
• A book sliding across a table at a constant speed
• A ball sitting on a shelf
• A can rolling down a ramp
• A swing moving back and forth
A car traveling at a constant speed of 15 m/s
• A bird landing on a branch
Which objects in the list experience an unbalanced force?
O A. The book, the ball, and the car
B. The ball, the car, and the bird
O C. The can, the swing, and the bird
D. The book, the ball, the can, and the swing
Look
Answer: C
Explanation:
Answer:
ccccccc
Explanation:
4. Blood is considered which of the following?
A organ system B organ C tissue
Answer:
C. tissue
Explanation:
Blood is considered a form of connective tissue.
I would a preciate the help
Answer:
D
Explanation:
What is the weight of a book that has a mass of 0.35 kg?
Answer:
3.5 NExplanation:
The weight of an object can be found by using the formula
W = mgm is the mass
g is the acceleration due to gravity which is 10 m/s²
From the question we have
W = 0.35 × 10
We have the final answer as
3.5 NHope this helps you
Answer:
4 pounds
Explanation:
i guesed
Ive been stuck on this on You have a total of 46 chromosomes, 23 from each parent. *
true or false 1st is brainliest
Answer:
yooooooooooooooooooooooooo
Explanation:
.What advantage would using a compound light microscope have over using a dissecting microscope?
The dissecting microscope is configured to allow low magnification of three-dimensional objects- objects larger or thicker than the compound microscope can accommodate. Furthermore, the two separate lenses of the binocular dissecting microscope allow one to see objects in three dimensions, i.e., in stereo
Why can't blue whales get cancer?
Answer:
Because it is so big the mutated cell is harmless to them because of teir cell count
Explanation:
Answer:
Even though larger animals like elephants and blue whales have up to 100 billion more cells than humans in their bodies — and therefore many more chances for harmful mutations to develop — they are much more immune to cancer.
Explanation:
Neurons that are i myelinated appear ___ which is what we call ____ matter
A. White:white
B.grey:grey
C. White:grey
D.grey:white
Answer:
A
Explanation:
Help actually I neeeeeed helps
Answer:on what do you exactly need help on?
Explanation:
how do enzymes speed up chemical reactions
3 ways
also one of them is lower activation energy and idk what else
Answer:
Enzymes lower the activation energy of a reaction by...
making the molecules' transition state stableproviding alternate reaction pathwaysdestabilising substratesExplanation:
Enzymes are complex, folded protein structures - in biological processes they facilitate chemical reactions.
Molecules usually collide at random, and specific chemical reactions (breaking and forming bonds) require the correct molecular orientation and energy to react. Enzymes..
provide an alternate reaction pathway with lower energy requirements. stabilize the molecules, keeping them in their transition states til they can react- these usually enter short lived, reactive and high-energydistort the substrate. These slightly alter their typical structures- bonds under stress are easier to manipulate and break, requiring less energy input for changes later onTime and large amounts of energy, are needed to arrive at these orientations to allow the reactions to occur- this is a barrier called activation energy.
Thus, enzymes help by lowering the activation energy needed for the reaction (e.g. hydrolyzing a bond) to progress, and they increase the rate of chemical reactions.
please helpppppppppp
Answer:
2nd option is correct .
Explanation:
In Anaphase ii , sis chromatids separates and pulled towards the opposite sides of the cell.
letter z most likely represents molecules of
Answer:
2) glycogen...................
If an organism is eukaryotic, many celled, can move and cannot make it owns food but must hunt or gather food, which kingdom would it be be placed into?
Answer:
Kingdom Animalia
Explanation:
An organism that is many-celled, can move, and cannot make its own food but must hunt or gather food would be placed in the kingdom Animalia.
Animals are generally heterotrophic, multicellular, and are able to move from one place to another. They ingest their foods and carry out digestion within their bodies and egest out undigested foods.
Animals are different from plants primarily in that they cannot make their own foods through photosynthesis. They are different from fungi in that they cannot carry out extracellular digestion of foods. Also, animals are different from bacteria and protists in that they multicellular rather than being unicellular.
which statement best describes the role of plate tectonics in changes that occur on earth
A. the movement of plates builds pressure that is released during an earthquakes
B. convection currents in the mantle cause mountain ranges to slowly collapse over time
C. the subduction of oceanic crust cools the mantle and prevents volcanic eruptions
D. seafloor spreading causing ocean basins to get smaller and shallower over time
Answer:
A
Explanation:
Just took the quiz
The statement that best describes the role of plate tectonics in changes that occur on earth is that the movement of plates builds pressure that is released during an earthquake, which is option a.
What is plate tectonics?Plate tectonics is the theory that explains the large-scale movements and interactions of the Earth's lithospheric plates, which make up the outermost layer of the Earth. These plates are made up of both the crust and the uppermost part of the mantle, and they move and interact with each other over time. The movement of plates is driven by convection currents in the Earth's mantle, which is the layer of hot, molten rock that lies beneath the crust. These currents cause the plates to move apart from each other at divergent plate boundaries, where new ocean crust is created.
Hence, the correct answer is that the movement of plates builds pressure that is released during an earthquake, which is option a.
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Imagine another universe that is completely empty except for a large solid sphere at rest. Suddenly, an identical sphere pops into existence 1 trillion kilometers away. What will happen?
1. Proteins are one of the four main
types of
A.biomolecules
B.living
C.complex
