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Molodets [167]
3 years ago
10

If dietary iodine levels are deficient you would expect that plasma TSH levels be and that plasma thyroxine levels would be

Biology
1 answer:
Doss [256]3 years ago
7 0

Answer:

Low,high

Explanation:

Thyroxine is a complex organic compound containing iodine. Thyroxine concentration in the body is kept to the required levels through a negative feedback mechanism. The production of thyroid stimulating hormone is regulated by thyroxine. An increase in thyroxine inhibits the pituitary gland which responds by secreting less thyrotropic hormone. This in turn reduces the activity of thyroid gland leading to a drop in thyroxine production. A low thyroxine level removes the inhibitory influence on the pituitary so that more thyroid stimulating hormone is produced.

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Organisms become extinct for many reasons. All BUT one is reason for extinction. That is
igomit [66]

Answer:

A) Adaptations

Explanation:

If a species learns to adapt to their environment, then they will not become extinct

5 0
3 years ago
Read 2 more answers
DNA is shaped like a twisted ladder. What do we call this shape/structure? pick the the correct answer.
Harrizon [31]

Answer:

The answer is 3. Double Helix.

7 0
3 years ago
What is the significance of the Galapagos Islands to the Theory of Evolution?
GenaCL600 [577]
It's where Charles wrote his book
3 0
3 years ago
Which of the following statements is the most likely explanation for plant withering due to leaky membranes in cold temperatures
podryga [215]

Answer:

C. H+ ions do not accumulate inside the thylakoid, so ATP synthase makes too little ATP.

Explanation:

Plant withering refers to the virtual death of plant cells due to lack of food. During the light-dependent reactions of photosynthesis, ATP needed for the synthesis of sugar (food) is created in the thylakoid membrane of the CHLOROPLAST of plant cells.

In the light-dependent reaction, hydrogen ions (H+) builds up/accumulate in the thylakoid lumen to create an electrochemical or proton gradient i.e. a difference in the concentration of H+ ions across the membrane. The hydrogen ions passes through a protein complex called ATP synthase, which forms ATP from ADP (by adding phosphate group), from the energy generated by the electrochemical gradient formed as a result of hydrogen in (H+) build up.

Hence, a plant that possess leaky membrane due to the cold temperature will likely wither because H+ ions are not able to accumulate inside the thylakoid causing a proton gradient, so ATP synthase makes too little ATP.

4 0
3 years ago
. You have constructed four different libraries: a genomic library made fromDNA isolated from human brain tissue, a genomic libr
aksik [14]

Answer:

A) Brain genomic library and muscle genomic library.

B) Brain genomic library and muscle genomic library - overlap completely.

Human brain cDNA library, and a human muscle cDNA library and other library is partially overlap.

Explanation:

A) The genomic library contains the whole genome content of the organism whereas cDNA library contains the coding genome of the organisms. Brain genomic library and muscle genomic library will constitute the all the genomic sequences of brain and muscle.  The cDNA library is prepared from the mRNA and the coding regions are present in this library.

B) The overlapping in the genome library might occur due to the common sequences present in the genome. Brain genomic library and muscle genomic library might completely overlap with each other as they have more sequence common among each other. All the other library may be partially overlap with each other as they have some common DNA sequences and neither library can have unique sequences.

7 0
3 years ago
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