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Rainbow [258]
2 years ago
13

Both ways of inducing active immunity (vaccines and direct environmental exposure to an antigen) will ultimately result in the p

roduction of antibodies. which of the five classes of antibodies is the first to be secreted during the primary response after the initial exposure to the antigen?
Biology
1 answer:
nadezda [96]2 years ago
8 0
More than likely IgM.
(Then followed by IgA and IgE antibodies) 

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using the gas pedal analogy explain the impact on the cell cycle of a proto-oncogene versus an oncogene
rusak2 [61]

Using the gas pedal analogy, the proto-oncogene would be an accelerator since they promote cell division and deregulate apoptosis, while tumor suppressor would be the brakes since they constrain the progress of the cell cycle and induce cell apoptosis. An oncogene is, therefore, when the accelerator is stuck in down position and the brakes are not working.






3 0
3 years ago
Assume population b and population c evolve until they reach adaptive peaks and experience stabilizing selection. Both populatio
vlada-n [284]

That population will have less variability in size which has slower rate of mutation or has experience less mutation.

<h2>What is mutation? </h2>

A mutation refers to a change in a DNA sequence of an organism. Mutations can result from DNA copying mistakes that is made during cell division, exposure to radiation or chemicals which is called mutagens, or infection caused by viruses.

If mutation occurs slowly or not completed, it will leads to less variability in size so we can conclude that the population will have less variability in size has experience less mutation.

Learn more about variability here: brainly.com/question/17031191

4 0
2 years ago
A phenotypic ratio for a dihybrid cross is predicted to be 9:3:3:1. The experimental values are:
Maslowich
Two traits that we are examining are the color (purple/white) and the smoothness. 
In our sample, we have 135 individuals ( 75 +28+24+8= 135).

Since we know that expected ratio of a dihybrid cross, is <span>9:3:3:1 we can calculate what is the expected values of each phenotype is.

So, for the white wrinkled phenotype, we expect that there will be one-sixteenth of the whole sample ( there are 16 parts of the whole sample 9+3+3+1=16).
So, we multiply the whole sample- 135 with one-sixteenth (or </span>0.0625) and get 8,4375.
When you calculate the values for all phenotypes you get results shown in the attached excel table.
When you have your expected and experimental values you compare them with a chi-square test. (The test determines if the difference between the expected and experimental results is statistically significant).


4 0
3 years ago
Read 2 more answers
All organisms are made of more than one cell
Nana76 [90]

That statement is false. Bacteria are single-celled organisms.

6 0
2 years ago
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The eukaryotes, bacteria, and archaea that live in and on the human body are called normal microbiota. When they were originally
Alla [95]

Answer:

The eukaryotes, bacteria, and archaea that live in and on the human body are called normal microbiota. When they were originally discovered, scientists thought that the relationship between these organisms was parasitic because they thought that the organisms benefit from living on the host but did not help the host. In recent years, researchers have determined that most of our resident microbes derive and give benefit to the host. This makes the relationship between host and microbe one of mutualism. Pathogenic, on the other hand, are microbes that cause diseases.

5 0
3 years ago
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