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Eddi Din [679]
3 years ago
5

"Housekeeping genes" in bacteria are commonly expressed constitutively, but not all of these genes are expressed at the same lev

el (the same number of molecules per cell). The primary mechanism responsible for variations in the level of constitutive enzymes from different genes is that:
Biology
1 answer:
Vesnalui [34]3 years ago
5 0

Answer:

Housekeeping genes may be defined as the genes that are constitutive genes important for the cellular functioning of the organism. The expression of housekeeping gene may or may not vary.

Some housekeeping genes are not expressed at same level because the housekeeping genes also have different promoters. The different promoters have different affinity to interact with the holoenzyme of RNA polymerase.

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What would happen to an animal cell with an internal salt concentration of 70% if it were placed in a salt solution with a conce
Daniel [21]
Answer:
A cell is placed in a highly concentrated salt solution. What will most likely happen to the cell if left in the solution? The cell will shrink in size, losing water due to osmosis.
3 0
3 years ago
Yeast cells are recovered from a fermentation broth by using a tubular centrifuge. Sixty percent of the cells are recovered at a
Serga [27]

Answer:

\\ \omega = 5033.22 \ rpm

Explanation:

Given that:

R_1 = 0.6\\\\R_2 = 0.95\\\\\omega_1 = 4000 \ rpm\\\\\omega_2 = ???\\\\Q_1 = 12\ l/min\\\\Q_2 =  12\ l/min

For a continuous centrifuge ; solid recovery R ∝ \frac{\omega^2}{Q}

where;

ω = angular velocity of the centrifuge in rpm

Q = flow rate

SO;

R_1 \alpha \frac{4000^2}{12}

R_2 \alpha  \frac{\omega^2}{12}

\frac{R_1}{R_2} = \frac{4000^2}{12}  ÷  \frac{\omega^2 }{12}

\frac{R_1}{R_2} = \frac{4000^2}{12} * \frac{12}{\omega^2}

\frac{R_1}{R_2} = \frac{4000^2}{\omega^2}\\\\\frac{0.6}{0.95} = \frac{4000^2}{\omega^2}

{\omega^2} = \frac{4000^2*0.95}{0.6}\\\\\\{\omega} = \sqrt{ \frac{4000^2*0.95}{0.6}}\\\\\\ \omega = 5033.22 \ rpm

7 0
3 years ago
You hear someone mention the molecule "amp." based on what you learned about the structure of atp and the way in which energy is
polet [3.4K]

ATP stands for Adenosine Triphosphate. This sounds like a complicated name, but when we break the name down, it's really a simple description of what makes up the ATP molecule. (***see attached pic***)

I don't know how in depth you need to know the structure of ATP, so let's keep it simple.  There are two major parts of the molecule (one is called "adenosine" and one is the "3 phosphates").  If you know that the prefix "tri-" means "3", then you can see that the name ATP is simply just telling you about the make-up of the molecule.

AMP stands for adenosine MONOphosphate. Therefore, it's two major parts are adenosine and 1 phosphate (because "mono-" means "1").

The energy from ATP comes from the bonds between the phosphates. Think of the molecule like a battery. The more phosphate bonds, the higher charged it is. Therefore, ATP has much more energy to release and power cellular functions than AMP does. AMP is actually the bi-product of the cell breaking ATP's phosphate bonds to release energy from them and power cellular functions.

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4 years ago
Which of the following microscopes has the lowest resolution
zhenek [66]
I believe it is dissecting 
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A grass starts with 30,000 kJ of energy. How much energy would a cheetah acquire after it ate a zebra that consumed the grass?
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