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3 years ago

Dopamine may function as a prolactin-inhibiting hormone. a. True b. False

Biology

2 answers:

vivado [14]3 years ago

6 0

True

Prolactin is a product of anterior pituitary gland and best known its role in the production of milk. Also, it plays essential role in the regulation of the immune system, metabolism and pancreatic development. However, secretion of prolactin is under inhibitory control that is mediated by dopamine.

fiasKO [112]3 years ago

3 0

One of the main functions of dopamine is to inhibit the hormone prolactin hence the answer is true. The secretion of prolactin is under inhibitory control of dopamine by inhibiting the D2 receptors of lactotrophs (prolactin producing cells) of the anterior pituitary gland.

Dopamine deficiency in the hypothalamus more often than not cause hyperprolactinemia which often manifests in females as amenorrhea.

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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

The public is not yet able to purchase cars powered by hydrogen fuel cells because engineers have to determine how the cars perf

alukav5142 [94]

Answer:

B - In real world conditions

Makes the most sense.....

5 0

4 years ago

Read 2 more answers

Siderophores are bacterial proteins that compete with the host's:______.a. antibodies. b. iron-transport proteins. c. white bloo

joja [24]

Answer:

The correct answer is iron-transport proteins

Explanation:

Siderophores are proteins produced by bacteria, and compete with the host's iron-transport proteins. They aim to bind and "hijack" the host's cell iron molecules for their own pathogenic cell processes

8 0

3 years ago

1. If the ability to taste PTC were controlled by only two alleles: one dominant (T) and one recessive (t), would there be any w

maw [93]

Answer:No

Explanation: there would not be a way to distinguish between Tt and TT without mating or DNA analysis because T is dominant in Tt, therefore has the same physical characteristics as TT.

8 0

3 years ago

Which of the following is made of cells?

WITCHER [35]

Answer:

need more information to answer this question

4 0

4 years ago