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3 years ago

12) How many countries do we know are growing GMO crops?

1 answer:

5 0

In total, 67 of the world's 195 countries have adopted biotech crops. It's the fastest adopted crop technology in the world, achieving a 112-fold increase since its commercial introduction in 1996.

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Which of the following statements is most accurate or true?

attashe74 [19]

Answer:

c. the neutral theory posits that the vast majority of mutations do not influence the fitness of individuals

Explanation:

The neutral theory proposed by Motoo Kimura states that the vast majority of changes at the molecular level (DNA) in a population happens due to genetic drift, not by natural selection, this implies that the mutations are neutral and do not give an advantage to the organisms.

This means that mutant alleles are preserved due to the randomness of life and not because this alleles give selective advantage over other individuals of the population.

4 0

4 years ago

What innate immune component is directly responsible for the lysis of the cell membrane of invading microorganisms?

larisa86 [58]

Answer:

The name of the innate immune component is MEMBRANE ATTACK COMPLEX.

Explanation:

The membrane attack complex is a type of structure that is usually formed on the surface of the cell membrane of invading pathogens due to the activation of the immune system. Membrane attack complex is also known as terminal complement complex. Individuals that lack this immune component due to mutations usually experience recurrent infections.

4 0

4 years ago

Brian is riding his skateboard to his friend's house. Brian is pushing on the ground with his foot to move himself and the skate

SVETLANKA909090 [29]

Radiant energy would be the best anwser for this

7 0

3 years ago

Read 2 more answers

Under what conditions is an antigen called an allergen?

IRINA_888 [86]

When it triggers an abnormal or vigorous immune responce, treating the antigen that would normally cause no threat as something harmful.

6 0

3 years ago

Why can't both strands of DNA be replicated at the same time?

saw5 [17]

Answer: DNA is a molecule made up of two strands, twisted around each other in a double helix shape. The two strands are complementary which have a 5 prime end and a 3 prime end. To understand this question you must first understand the steps that follow.

DNA Replication:

Step one: 

DNA Helicase (unzips) separates the strands.

Step two:

DNA Primase starts the process and makes a small piece of RNA called a primer. This marks the starting point for the DNA.

Step three:

DNA Polymerase binds to the primer and will make the new strand of DNA. DNA Polymerase can only add DNA bases in one direction, from the 5 prime end to the 3 prime end.

The leading strand is made continuously.
The lagging strand does not run continuously because it runs in the opposite direction. Each fragment is started with an RNA primer. DNA Polymerase then adds a short row of DNA bases from the 5 prime to 3 prime direction. This results in okazaki fragments because it can only replicate in small chunks. The process is repeated.

Step four:

Once the new DNA is complete the enzyme exonuclease removes all the RNA primers from both strands of DNA.

Step five:

Another DNA Polymerase fills in the gaps that are left behind with DNA.

Step six:

DNA Ligase seals up the fragments in DNA, in both strands to make a continuous double strand.

Final answer:

DNA Replication cannot replicate at the same time due to the leading and lagging strand.

Good luck!

7 0

3 years ago