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3 years ago

What is the name for molecules that provoke a specific immune response?

1 answer:

3 0

The molecules that provoke a specific immune response are called antigens.
This molecule initiates the production of an antibody and causes an immune response. Toxins, chemicals, bacteria, viruses, or other substances that come from outside the body can be part of the antigens.

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22. A plant geneticist is investigating the inheritance of genes for bitter taste (Su) and explosive rind (e) in watermelon (Cit

mylen [45]

Answer:

See the answer below

Explanation:

Using the formula for calculating Chi square ( $X^2$ ):

$X^2$ = $\frac{(O - E)^2}{E}$ where O = observed frequency and E = expected frequency.

The observed frequencies for the four phenotypes are 88, 62, 62, and 81 respectively.

For the expected frequency, the phenotypes are supposed to assort in 9:3:3:1 according to Mendel ratio.

Hence, expected frequencies are calculated as:

phenotype (1) = 9/16 x 293 = 164.81

phenotype (2) = 3/16 x 293 = 54.94

phenotype (3) = 3/16 x 293 = 54.94

phenotype (4) = 1/16 x 293 = 18.31

The $X^2$ is calculated thus:

Phenotype O E $X^2$

1 88 164.81 $\frac{(88 - 164.81)^2}{164.81}$ = 35.80

2 62 54.94 $\frac{(62 - 54.94)^2}{54.94}$ = 0.91

3 62 54.94 $\frac{(62 - 54.94)^2}{54.94}$ = 0.91

4 81 18.31 $\frac{(81 - 18.31)^2}{18.31}$ = 214.64

Total $X^2$ = 35.80 + 0.91 + 0.91 + 214.64 = 252.26

To the nearest tenth = 252

Degree of freedom = n - 1 = 4- 1 = 3

$X^2$ tabulated = 7.815

The calculated  $X^2$  exceeds the critical value, hence, the null hypothesis is rejected. The two genes did not assort independently. 

4 0

3 years ago

Question 1 (Multiple Choice)

choli [55]

1. A forensic pathologist would most likely perform a forensic autospy. Forensic pathologists focus on cause of death by examining a bod or corpse. They perform postmortem examinations.

2. Insect activity will begin immediately if a body is left in the open. That is why insect activity can help investigations with determining certain things such as time of death, where the person died and the like.

3. A light meal will digest in about 1-2 hours. Digestion rates can give useful information about when a person had died. Medium meals take about 3-4 hours to digest and heavier meals take about 6 hours.

4. Indicative acts are actions or behaviors that may or may not have taken place before someone dies. Indicative is suggestive, so it may or may have happened. When you say indicative acts you are referring to what may have happened (or may not) based on certain circumstances, observations or evidence.

8 0

3 years ago

Which of these are by-products of cellular respiration?

natima [27]

Answer:

Explanation:

I think ATP is energy and the cells get that after cell respiration. And we breathe out Carbon dioxide

8 0

3 years ago

How are bacteria different from viruses?

Alex777 [14]

Answer:

Explanation:

bacteria can replicate themselves without help from a living cell.

7 0

3 years ago

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When sediments deposit in lakes or oceans, how do they lay? in large vertical mounds that spread out towards thin horizontal lay

Taya2010 [7]

"In flat horizontal layers" is the one among the following choices given in the question that describes the way how sediments deposit in lakes or oceans. The correct option among all the options that are given in the question is the third option. I hope that this is the answer that has come to your desired help.

8 0

3 years ago

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