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s2008m [1.1K]
2 years ago
12

Which of the following statements is true of hormones? a. They are secreted exclusively by glands that have ducts. b. They are s

ecreted exclusively by the pituitary gland. c. They are secreted directly into the bloodstream. d. They transmit hereditary traits across generations.
Biology
1 answer:
Serga [27]2 years ago
6 0

Answer:

The correct answer is Hormones are secreted directly into the blood stream

Explanation:

Hormones exibit their function by endocrine signaling.At first they are secreted from a gland for Example pituitary gland ,Thyroid gland,adrenal gland directly into the blood stream.Then they are transported via blood to the target cell and bind to the receptor of the target cell thereby activating the later.

      The acivation of receptor molecule generate biochemical signals that stimulates the activity of various enzymes ,growth factor to carry out the biochemical process related to the functioning of the target cell.

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A flash flood carried a raft of Amazon ants away from their original population. There is enough distance between the two groups
vitfil [10]

Answer:

geographical isolation

Explanation:

Reproductive isolation is a process of evolution that ensures that members of different species are incapable of mating and when they do, such mating do not result into any offspring or leads to the production of invalid offspring.

There are two mechanisms of reproductive isolation:

  • Pre-zygotic mechanisms prevents fertilization between two different species and these include habitat isolation, mating seasons, mechanical isolation, gamete isolation,  geographical isolation and behavioral isolation.
  • Post-zygotic isolation prevents the products of fertilization from becoming valid and this include hybrid inviability, hybrid sterility and hybrid breakdown.

<em>Geographical isolation involves the existence of geographical barriers between two populations such that there cannot be mating between the two. The two populations eventually evolve to become different species.</em>

<em />

3 0
3 years ago
Which will most likely cause an increase in the frequency of genetic mutations in
Aleksandr [31]

Answer:

Increased exposure to X-rays

Explanation:

X-rays shoot harmful radiation through your body, that's why when you go to the dentist or other places and they take a X-ray they give you a lead vest to protect your organs from unneeded radiation.

hope this helps :)  

8 0
3 years ago
Auxins _____.
arlik [135]
I believe auxins are used for fast growth in of the stem(shoot), retention of fruits, it induces flowering
3 0
3 years ago
Read 2 more answers
What is the role of microfilaments in cell division?
Sedbober [7]
Another important function of microfilaments is to help divide the cell during mitosis (cell division) microfilaments aid the process of cytokinesis which is when the cell “pinches off” and physically separated into two daughter cells
6 0
2 years ago
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g In transcription, the 3'-hydroxyl group of the growing RNA strand: Group of answer choices NONE OF THESE binds to the 5' ribos
Tatiana [17]

Answer:

attacks the outermost phosphorous group of the incoming nucleotide.  

Explanation:

Transcription is the biological process where RNA is formed. As you may already know, RNA is an extremely important nucleic acid for genetic processes and the production of proteins. The transcription has three steps that are called start, elongation and end. In the elongation phase, the RNA strand is growing, at this time, RNA polymerase, which is the enzyme responsible for RNA elaboration, places the nucleotides, in the RNA strand, in the 5' - 3' direction. This enzyme causes the hydroxyl, which makes up the nucleotide at the 3' end of the forming RNA, to attack the phosphorus present in the incoming  ribonucleotide.

8 0
2 years ago
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