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masya89 [10]
3 years ago
9

What evidence do we have that DNA exists?

Biology
1 answer:
makvit [3.9K]3 years ago
3 0
Dna exists in the cells of all living organisms and dna proves evolution
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Which of the following expressions is not a function of mitosis?
madam [21]

The answer would be "production of gametes" or the first option. Is a mature haploid male or female germ cell which could collide with the opposite sex of the germ cell then for a thing called a zygote which is diploid cell that was formed because of the two gametes cells.


Hope this helps!

6 0
3 years ago
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What kind of lab equipment would you use to conduct a small chemical experiment
Alexandra [31]

Answer:

Beaker - A beaker is a glass container with a flat bottom and a small spout for pouring. It is used in the chemistry lab for mixing, heating, and stirring liquids. Beakers come in various sizes and are shaped like a cylinder.  

Chemistry lab beakers Beakers

Bunsen burner - The Bunsen burner is a metal tube that produces a flame from gas such as methane, propane, or butane. It is used in the lab for heating and sterilizing. The Bunsen burner is named after German chemist Robert Bunsen.  

Bunsen burner

Crucible - Crucibles are containers used for heating substances to very high temperatures. They are generally made from materials such as porcelain, nickel, and alumina.  

Erlenmeyer flask - This is a type of chemistry flask with a conical shaped body, a cylindrically shaped neck, and a flat bottom. It generally has measurement marks on the side. It is similar to a beaker, but has the cone shaped body. The cone shape reduces losses from evaporation and helps to prevent spills when stirring the liquid.  

Erlenmeyer flask

Funnel - A funnel is a pipe with a wide mouth that helps to pour substances into a container without spilling. In a chemistry lab, funnels are often used together with filters to separate a mixture.  

Funnel and flask

Gloves - Laboratory gloves are important to wear in order to protect the skin from chemical substances. Always listen to your teacher and make sure to wear gloves when performing experiments.  

Always wear gloves

Goggles - Goggles are very important when performing experiments of any kind. They can keep dangerous chemicals and other substances from damaging your eyes. Always wear your goggles in the lab!

Always wear goggles

Graduated cylinder - A tall skinny cylinder used to measure volumes. It is generally a more accurate way to measure volume than a typical beaker or flask.  

Graduated cylinder

Mortar and pestle - A mortar and pestle are used to crush and grind solids into a powder. The mortar is a bowl and the pestle is a small club-shaped tool. They are typically made from ceramic or stone.  

Mortar and pestle

Pipette - A narrow glass tube used to transfer liquids from one place to another. Pipettes sometimes are used for measurement. The accuracy of different pipettes varies widely.  

Pipette

Scoopula - A scoopula is a metal spatula-type utensil used to scoop up solids such as powders in a chemistry lab.  

Stirring rod - A skinny solid glass rod used in chemistry to mix chemicals and liquids. A stirring rod is typically about the length of a long straw and has rounded ends.  

Test tube - A test tube is a glass or plastic tube used for holding, mixing, and heating small quantities of liquid chemicals. Test tubes often have a flared top to help with pouring. They come in a variety of sizes.  

Test tube holder - A stand built for holding multiple test tubes.  

Test tube brush - A brush designed to help clean out test tubes.  

Test tube clamps - Clamps that hold test tubes while using them to heat up chemicals during a lab experiment.  

Test tubes in a holder

Thermometer - A device used for measuring the temperature of a substance.  

Triangle - A triangle made of clay pipes and wire that can withstand high temperatures. It is often used to hold a crucible.  

Wire gauze - A wire gauze is used to support a beaker or flask when heating. The wire gauze helps to spread the heat evenly.

7 0
3 years ago
What substance can be formed through the ionic bonding of an anion and a cation
PtichkaEL [24]
A salt can be formed

7 0
2 years ago
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When carbonate minerals come into contact with hydrochloric acid they
alexira [117]
hydrochloric acid they Fizz
5 0
3 years ago
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Some health science sites may restrict employees from wearing perfume or other scents.
Verdich [7]

The given statement is true.  

Some of the health science sites may restrict employees from wearing perfumes or other fragrances because the chemicals in the fragrances can stimulate reactions ranging from headaches to palpitations of heart in some of the individuals who are sensitive to them, making it tough for them to work efficiently.  

With time, the individuals getting exposed to the chemicals present in the fragrances become more sensitized to them to the point that they can no longer tolerate any more exposure. This can initiate breathing issues, nausea, sneezing, disorientation, and in extreme situations, they can even go into shock.  


5 0
3 years ago
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