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taurus [48]
3 years ago
6

Which of these occurs first?

Biology
1 answer:
SpyIntel [72]3 years ago
7 0

Answer:

The correct answer is a.  Helicase unwinds DNA

Explanation:

DNA replication is a process in which DNA make it's own copy. There are several enzymes and factors which access the DNA replication process like helicase, primase, SSB protein, DNA polymerase etc.

The first step in DNA replication is the unwinding of double stranded DNA which is accomplished by an enzyme called Helicase. Helicase opens up the double stranded DNA at replication fork by breaking the hydrogen bond between the nucleotides of complementary strands.

This provides a single stranded template for DNA polymerase to form a new complementary strand. In <em>E. coli </em>Dna B is the primary helicase and in humans the primary helicase is MCM( minichromosome maintenance protein complex).

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Which of the following factors does not affect membrane permeability?
hram777 [196]

Answer:

a. The polarity of membrane phospholipids.

Explanation:

Phospholipids are the amphipathic lipids with polar heads and non-polar tails. The non-polar tails of two lipid layers form the core of the membrane while their heads are oriented towards both of the faces of the membrane. The polarity of the phospholipids does not affect the transport of substances. If a membrane has more of the saturated phospholipid tails in its core, the tight packing of the tails makes the membrane less permeable for large and polar substances.

On the other hand, a membrane with a greater proportion of unsaturated hydrocarbon tails in its core is more permeable. Cholesterol is also an amphipathic sterol and moderates the fluidity of membrane and thereby affects its permeability. A more fluid membrane is more permeable than a more solid membrane. Temperature affects the membrane polarity by affecting the membrane fluidity.

7 0
3 years ago
What do you call the living part of the enviroment?
Maurinko [17]
Abiotic 

ecosystem is how they interact and population is all the inhabitants/how many there are
3 0
4 years ago
How do plant populations affect predators ?
madreJ [45]
If theres no plants then the animals that eat those plants die then the animal the eats that animal die and so on. Hope this helps!
4 0
3 years ago
After glycolysis the pyruvate molecules go to the
AlekseyPX
I believe the correct answer is C.
4 0
3 years ago
When using muzzleloading firearms Fg, FFg, FFFg and FFFFg are examples of what?
lana [24]

Answer:

B, Different granulation sizes of black powder

Explanation:

A muzzleloader firearm is a firearm that has a muzzle through which the propeller and the projectile is loaded from. For muzzleloader firearms,  Fg, FFg, FFFg and FFFFg are examples of Different granulation sizes of black powder. The number of F's represent how the black powder is grounded, FFFFg is the smoothest and is used for muzzleloading rifles of 45 caliber and smaller. FFG is less smooth and is used in muzzleloading rifles larger than 45 caliber while FG is the most coarse used in large bore shotguns.

4 0
4 years ago
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