How do your shoulders and elbows move in different ways?

In his work with pneumonia-causing bacteria and mice, Griffith found that the protein coat from pathogenic cells was able to tra

nadya68 [22]

1. The correct answer is: some substance from pathogenic cells was transferred to nonpathogenic cells, making them pathogenic

Griffith in his experiment used two related strains of bacteria (Streptococcus pneumonia), known as R and S and mice, trying to develop a vaccine against pneumonia.

• R strain-formed nonvirulent, rough-edged colonies

• S strain- rounded and smooth colonies, with sugar protection coat, virulent

Mice that were injected with S strain developed pneumonia and died. But, when mice were injected with heat-killed S strain it did not cause disease in mice.The next part of experiment is the injection of combined harmless R bacteria with harmless heat-killed S bacteria. The result was that the mouse developed pnenumonia and in blood sample from the dead mouse, living S bacteria were found. From his experiment, Griffith concluded that injected together, R strain and S strain bacteria most likely “communicate”. The R-strain bacteria took "transforming principle" (we know today that this is genetic material DNA) from the heat-killed S bacteria which allowed them to "transform" into virulent bacteria.

2. The correct answer is: DNA polymerase can join new nucleotides only to the 3’ end of a preexisting strand.

DNA replication (or the synthesis of DNA) begins when the helicase unfolds the double-stranded DNA. The forked structure is formed and DNA synthesis by the DNA polymerase can start. DNA polymerase is an enzyme that works only in one direction-5' to 3' (new nucleotides are added only to the 3’ end), so it replicates the leading strand continuously. On the other hand, lagging-strand replication is discontinuous( Okazaki fragments are formed and later linked together).

3. The correct answer is A + G = C + T

This is according to Chargaff's rule which states that DNA should have a 1:1 ratio of pyrimidine and purine bases (the amount of guanine should be equal to cytosine and the same thing with adenine and thymine).

4. The correct answer is: depends on the action of DNA polymerase.

Elongation is the second stage of DNA replication process (the first one is initiation and the third one is termination). The main enzyme during this phase is DNA polymerase, which adds nucleotides on newly synthesized polynucleotide strand. . DNA polymerase is an enzyme that works only in one direction-5' to 3' (new nucleotides are added only to the 3’ end). Only the nucleotide that is complementary to the template nucleotide can be added to new strand.

7 0

3 years ago

Which of these is not a property of lymphatic capillaries?

Inessa05 [86]

Answer:

They are smaller than blood capillaries.

Explanation:

Lymphatic capillaries drains the extracellular fluid present between the cell spaces. The fluid is known as lymph as it enters the lymph capillaries. These capillaires drains into lymph vessels that drains to lymph nodes and lymph ultimately enters the venous circulation.

Lymphatic capillaries are slightly larger than blood vessels and these capillaries have close ends. The walls of lymph capillaries are made up of endothelial cells. The endothelial cells overlap in lymph vessels and when the pressure in ECF is greater these cells move and create a sort of gap for the movement of ECF inside the lymph capillary but when the pressure inside the capillary is greater these cells again overlap and does not allow the lymph to move outside of capillary. Thus lymph capillaries only allow the ECF to enter the capillary but does not allow the lymph to go out from capillary. Lymph capillaries have greater internal pressure than blood vessels.

7 0

4 years ago

What is the genotype of the mother? A. PP B. pp C. Pd D. P

tekilochka [14]

Answer:

I want to say its A

Explanation:

8 0

3 years ago

BRAINLIESTTTT ASAP!!! How can space exploration impact the economy and culture of a region?

Lilit [14]

Hello, Geny5!! Space exploration has affected the economy by simple things such as technology and airline businesses. In the technology field, portable devices, like cell phones, mostly started with portable communication systems in space. Whereas the airline business, a lot of the technology in airplanes today was used in order to travel to space and for exploration. If you think about it, when astronauts talk to each other in space, they are using portable technology like cell phones. In airplanes, they have oxygen and the ability to control how to stay in the air/fly/land, like rockets and other things NASA uses. Culturally, it would boil down to technology, again. Many things in our lives today are centered around technology, just like space exploration. They have to have the technology to get them into space and come back down. If it wasn’t for space exploration, we wouldn’t have computers, cell phones, or even solar panels. I hope this helped!! Have a great evening!! :)

8 0

4 years ago

Where does your blood become oxygenated ("picks up" oxygen)?

ra1l [238]

Answer:

C. The lungs

Red blood cells pick up oxygen in the lungs. Blood travels away from the heart and lungs through the arteries. Red blood cells drop off oxygen to the cells through tiny tubes called capillaries. Blood then returns to the heart through the veins and the cycle begins again.

5 0

3 years ago