1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
PtichkaEL [24]
3 years ago
10

The water flowing over land is called ?

Biology
2 answers:
DaniilM [7]3 years ago
7 0
Im not sure but im guessing a river?
Vanyuwa [196]3 years ago
7 0
The ocean or sea water?
You might be interested in
Today, the continents of Europe and Asia and the subcontinent of India form a single landmass. True or false?
Juli2301 [7.4K]

Answer:

true

Explanation:

Because if you look on a map all three of them are altogether and not split apart making one big landmass.

4 0
2 years ago
How does negative feedback mechanism work in osmoregulation
Charra [1.4K]

Answer:

Osmoregulation is an example of a negative feedback, homeostatic control system. This system detects changes in the salinity of the water Chinook salmon live in, working to keep the body water concentration constant.

Explanation:

4 0
3 years ago
What is the determining factor for the transcription of structural genes of the trp operon?
padilas [110]

The right answer is 3. the availability of tryptophan in the environment

The TRP operon regulation depends on the availability of the tryptophan molecule (it depends if the cell need tryptophan or already has it).

There are two modes of regulation of the trp operon: Suppression and Mitigation

*Repression

The synthesis of operon mRNA is controlled by a repressor that blocks transcription when bound by tryptophan, which acts as a co-repressor.

The repressor, a 108 aa homodimer (ie 2 apo-repressor), has helix-turn-helix domains that interact with inverted repeats at the major groove of the operator, thus allowing its fixation.

In the absence of trp, the repressor is inactive and does not attach to the operator. The RNA polymerase can bind to the promoter and transcribe the trp E, D, C, B, A structural genes.

In the presence of trp, the repressor changes conformation and becomes active, so it binds to the operator, preventing RNA polymerase from accessing the promoter so transcription will not occur.

* The Attenuation

This is a premature termination of transcription that is a function of Trp concentration. It takes place at a late moment of transcription while regulation by repression is done during the initiation.

1st Case: Low Trp Rate, Continuous Transcription, → Formation of the Anti-attenuator in the absence of trp, and therefore the synthesis of tryptophan is continued.

2nd case: High rate of trp, stop transcription, → Formation of the attenuator in the presence of trp. This one will attenuate the synthesis of tryptophan.

4 0
3 years ago
Describe the general types of diagnostic tests used to diagnose patients infected with HIV.
GenaCL600 [577]

AIDS

This disease leads to death by weakening the immune system of the human body.  Common symptoms are related to the nervous system like dementia, anxiety, depression and insomnia.

TESTS

The tests for AIDS are discussed below.

The most common test for any disease is the blood test.  

When human body is infected with the virus, the body produces anti-bodies to combat this infection. The blood test is positive if these anti-bodies are present in the blood sample of the infection person. However, it takes time for these anti-bodies to appear in the blood stream, hence, blood test should be done at regular intervals.

The tests specifically developed for AIDS are as follow.

ELISA or Enzyme-linked immunosorbent assay

If this test is positive, this is followed by a Western Blot test. The blot test is done in order to confirm the disease.

As said before, anti bodies take time to develop. If the test is done during this phase, it will be negative despite of the presence of virus in the blood stream.

HOME

Only one home test is approved. This is called Home Access Express Test. The kit of this home test is available at pharmacies.

SALIVA

The saliva from the patient’s cheek is obtained on a cotton pad. This pad is put in a vial which is then sent to the lab for testing.  If the result is positive, blood test is done to confirm the disease.

VIRAL LOAD

As the name suggests, this test measures the quantity of virus present in the blood. This test is done to either test the presence of HIV or to track the progress of the treatment of HIV.

WESTERN BLOT

This test is done when the result of ELSA test is positive. This test confirms the disease.

All the above test if turn out negative and the patient still doesn’t recovers, this testing should be done periodically until the disease is confirmed.

6 0
3 years ago
EWWQDWAQDQWEW11EQWEW11E41241221412412412QE421421WWEW11EQWEW11EQWEW11EQWEW11EQWEW11EQWEW11EDEQWQWEW11EQWEW12411EQ21W4124124WEW11E
Anettt [7]

Answer:

??

.

.

6 0
3 years ago
Other questions:
  • The process indicated by the letter _____ produces a diploid structure. A life cycle of the black bread mold. Each letter marks
    6·1 answer
  • Raekwon wanted to see if listening to music would make the basketball players make more
    10·1 answer
  • Carl jung believed that the collective unconscious contains ________ derived from our species' universal experiences.
    5·1 answer
  • 4. Explain Are the cells
    15·1 answer
  • During photosynthesis different gases move in and out of plant cells which phrase best represents the net flow of gases involved
    15·1 answer
  • Helpppp what do geologists think happened as the last ice age ended ?
    7·1 answer
  • Picture attached
    5·1 answer
  • CAN SOMEONE PLEASE HELP ME WITH THIS SCIENCE QUESTION I WILL MARK YOU BRAINLIEST THANK YOU !!!
    9·2 answers
  • BRAINLIEST FOR RIGHT ANSWER NO FOOLING AROUND 50 POINTS
    10·2 answers
  • Passage of peptides through the blood-brain barrier with colloidal polymer particles (nanoparticles). Brain Res 1995, 674 (1), 1
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!