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Shtirlitz [24]
3 years ago
13

The lac operon controls the transcription of a group of genes involved in metabolizing lactose in E. coli. A group of scientists

tested how to activate the lac operon. In four different mediums, they varied whether glucose or lactose was present in the medium, as indicated by a or -.The scientist discovered that the lac operon is inducible, repressed by glucose and induced by allolactose. Which medium has the right conditions to metabolize lactose
Biology
1 answer:
Xelga [282]3 years ago
3 0

Answer:

The correct answer would be - medium with lactose present and glucose absent.

Explanation:

There are genes present in lac operon that takes part in the lactose metabolism. These genes expressed only if a medium has lactose in absence of glucose.

In the absence of glucose and lactose is present, due to inducer the lac repressor is removed from the operator. This leads to the binding of CAMP to DNA as the CAMP levels are high. It helps in high transcription levels b binding RNA polymerase to promotor.

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The best answer is B.

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7 0
3 years ago
Every year _______ species go extinct.<br> a. 3<br> b. 72<br> c. 1000<br> d. 20000
Nezavi [6.7K]

c . 10000 its right i took the quiz

7 0
3 years ago
Read 2 more answers
Drag each Moon phase to the correct location on the image.
ruslelena [56]

The correct order of the given moon phases starting with new moon is new Moon, waxing crescent Moon, first quarter Moon, waxing gibbous Moon, full Moon, waning gibbous Moon, last quarter Moon.

<h3>What are Moon phases?</h3>

This cycle has been divided into four primary Moon phases: New Moon, First Quarter, Full Moon, and Last Quarter. Waxing Crescent, Waxing Gibbous, Waning Gibbous, and Waning Crescent are the four secondary phases.

The missing image of the question is attached at the last.

The correct order of the given moon phases starting with new moon is new Moon, waxing crescent Moon, first quarter Moon, waxing gibbous Moon, full Moon, waning gibbous Moon, last quarter Moon.

Thus, this way the lunar phases can be placed in the correct order.

For more details regarding moon phases, visit:

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3 0
2 years ago
HELP!!!! Time crunch!
Mila [183]

Answer:

Glycolysis is a series of reactions that take place in the cell cytoplasm. It involves the oxidation of glucose into pyruvate (a 3 carbon compound), that produces (overall)ATP and reduced NAD: an enzyme that carries hydrogen. The number of carbons in each of these compounds is indicated in the green circle.

The carriers FAD and NAD bring the hydrogen and it separates to H+ and electrons (e-). The electrons pass from carrier to carrier and loose energy. This is used to synthesize ATP.

However, there are a lot of hydrogen ions, that unless they are removed, they'll cause a large increase in pH. Therefore, oxygen reacts with the ions to remove it and produce water. This is what the oxygen you inhale is used for (in terms of respiration).

Explanation:

:) hope that helps  

:) Dez-tiny

7 0
3 years ago
Water has special characteristics because of the nature of hydrogen bonds what are they?
Amanda [17]

Water has special characteristics because liquid water is denser than ice and ice floats on top of liquid water​.

Answer: Option A & D

<u>Explanation:</u>

A water molecule is formed by the covalent bonding between two atoms of Hydrogen atom with one atom of Oxygen. In water, the Hydrogen bonds are the one that keeps the water molecule intact.  

When the water molecule freezes the bonding becomes weak as they are separated and set apart which makes the liquid water denser than ice. Normally a substance floats if it is less dense. Ice floats because it is less dense than water.  

5 0
3 years ago
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