In the DNA isolation process, cells are mixed with sodium chloride (i.e. NaCl) because the sodium (Na ) neutralizes the negative charge of DNA.a. True b. False
It is true that in the DNAisolation process, cells are mixed with sodium chloride (i.e. NaCl) because the sodium (Na ) neutralizes the negative charge of DNA.
What is DNA isolation?
DNA extraction is a method of separating DNA from cell membranes, proteins, and other cellularcomponents using physical and/or chemical methods from a sample. In 1869, Friedrich Miescher isolated DNA for the first time.
The ability to extract DNA is critical for studying the genetic causes of disease and developing diagnostics and drugs.
It is also required for forensicscience, genome sequencing, detecting bacteria and viruses in the environment, and determining paternity.
Because sodium (Na+) neutralizes the negative charge of DNA, cells are mixed with sodium chloride (i.e. NaCl) during the DNA isolation process. It makes homogenization easier.
You are given a sample of unknown cells to examine. Analysis of their nuclei reveals that each cell contains 23 chromosomes. What types of cells might these be?a. Ova b. skin cells c. liver cells d. white blood cells
Explanation: When an egg cell and sperm cell join together, the fertilised egg cell contains 23 pairs of chromosomes. One chromosome in each pair comes from the mother, the other from the father.
Thomas and Julie wanted to find out which material would insulate theirteacher's coffee cup and keep the coffee hot for the longest period of time. They first wrapped her cup with bubble wrap and recorded the temperature of the coffee once every 15 minutes for 2 hours. They repeated the investigation, this time using newspaper instead of bubble wrap, but they got the same results for both materials. Which of the below is their control or constant variable? the type of insulation the temperature of the coffee the type of coffee cup The students conducting the experiment
The type of coffee cup
Because the insulation changed
The type of coffee temperature can change
The students can change
The gene for hemophilia in humans is present on the X chromosome only. Which inheritance pattern does hemophilia in humans represent?Homozygous Multiple alleles Polygenic Sex linked
i think its sex linked but im not sure.
If it is an X-Linked trait, the answer would have to be "Sex-Linked". If it is on the X chromosome, it is on a sex chromosome.
Yes, D is correct.
Beginning with carbon fixation, arrange the steps of the Calvin cycle in the correct order
Answer is: Carbon Fixation, Reduction Phase, Carbohydrate Formation, and Regeneration Phase. If you have any questions about these, drop a comment!
Which list of words describes an action potential?all or none, neurotransmitters, membrane potential
electrical signals, all or none, neurotransmitters
all or none, membrane potential, electrical signals
All or none, membrane potential, electrical signals is list of words describes an action potential. Option 4 is correct.
An action potential is a rapid change in the electrical potential of a cell membrane. It is a wave of depolarization that travels down the axon of a neuron. Action potentials are "all or none" events. This means that they either occur fully or not at all.
Action potentials are triggered by changes in the membrane potential. The membrane potential is the difference in electrical charge between the inside and outside of the cell membrane. When the membrane potential reaches a certain threshold, an action potential is triggered. This threshold is called the refractory period.
Once an action potential is triggered, it travels down the axon of the neuron. The action potential causes the release of neurotransmitters at the synapse. Neurotransmitters are chemicals that allow neurons to communicate with each other. They bind to receptors on the next neuron, which can trigger another action potential. Option 4 is correct.
What do I already know about chemical and physical properties and changes? Identifying Pure Substances Which of the following is a pure substance? Select all that apply. A. air B. distilled water C. iron sulfide D. oxygen gas E. seawater F. sodium chloride