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Lady_Fox [76]
4 years ago
10

The trp operon in E. coli is regulated in such a manner as to allow expression of the genes only when cellular levels of tryptop

han are low. When tryptophan levels are adequate, the secondary structure of the mRNA halts translation. This form of regulation is known as ________.
Biology
1 answer:
vazorg [7]4 years ago
6 0

Answer:

attenuation

Explanation:

Based on the scenario being described within the question it can be said that the form of regulation that is being described is known as attenuation. In the context of genetics, this is a specific mechanism that provides control in various bacterial operons that result in term results in premature termination of the transcription.

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Salvesen h, piehl-aulin k, ljunghall s. changes in levels of the carboxyterminal propeptide of type i procollagen, the carboxyte
Dennis_Churaev [7]
Physical exercise preserves bone mass. Measurements of bone biomarkers may reflect the events in bone during exercise. Fifteen healthy, well-trained individuals (7 men and 8 women) performed a running test for 21 min until exhaustion. Venous blood samples were drawn before and 30 min after the exercise to measure the levels of osteocalcin, the carboxyterminal propeptide of type I procollagen (PICP) and the carboxyterminal cross-linked telopeptide of type I collagen (ICTP). After exercise, the women had a marked increase in serum osteocalcin concentrations (from 7.5±5.0 μg/1 to 11.5±3.0 μg/1), whereas the level was unaffected in the men (from 14.5±3.0 μg/1 to 13.5±4.6 μg/l). In the men there was a marked increase in PICP (from 240±47 μg/1 to 268±56 μg/1) that was not seen in the women (from 244±70 μg/1 to 253±60 μg/1). In neither group did ICTP levels change. In conclusion, significant responses were seen in PICP and osteocalcin during exercise, indicating that such measurements may be valuable for the further delineation of the effects of physical activity on bone. Furthermore, the different responses in men and women point to interesting areas for future studies.
6 0
4 years ago
Describe the experiment, to show that light intensity, water, chlorophyll, and cabondioxide are needed for photosynthesis
lisov135 [29]

Answer:

Is light needed for photosynthesis?

1. Destarch the plant (remove previously made starch from plant)

2.  a. cut the leaf in 2

b. 1 part in an opaque box and 1 part in a transparent box (one with light and one without)

     3. Test for starch (BEWI)

B. Is carbon dioxide needed for photosynthesis?

1. Destarch the plant (remove previously made starch from plant)

2.  a. cut the leaf in 2

b. 1 part in a box with CO2 absorber and 1 part in box with a CO2 provider

     3. Test for starch (BEWI)

C. Is chlorophyll needed for photosynthesis?

1. Destarch the plant (remove previously made starch from plant)

2. Use a variegated leaf

     3. Test for starch (BEWI)

B E W I

1. Put leaf in boiling water to destroy the cell membrane and denature enzymes

2. Ethanol in a hot water bath to remove chlorophyll

3. Warm water to soften the leaf

4. Add drops of iodine solution

Explanation:

3 0
3 years ago
Which of the following best defines genomics?
lara [203]
It is a complete set of an organisims gene so the aanswer would be B. the study of genomes and organisims

8 0
3 years ago
Read 2 more answers
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sertanlavr [38]

Answer:

alveoli

Explanation:

They are the smallest structures in our lungs where capillaries exchange O2 and CO2 in blood.

6 0
4 years ago
Which of the following items found in a newspaper is meant to entertain the reader?
klio [65]

(A) The news article. Because the newspaper article is containing information and things that're occurring and are the most popular news recently.

6 0
3 years ago
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