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faltersainse [42]
3 years ago
8

Which cell structure is referred to as the gatekeeper because it directs substances to move into and out of the cell? a cell wal

l b nucleus c vacuole d cell membrane?
Biology
1 answer:
liq [111]3 years ago
3 0
The answer would be A
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a researcher wishes to know whether there is a significant difference in the number of knee injuries reported among four sports.
boyakko [2]

Answer:

Chi-square analysis cannot be used to check for significant difference in the number of knee injuries among four sports.

Explanation:

The chi-square analysis is a statistical procedure that is used to test association between measured variables or goodness of fits of a set of measured variables to expected outcomes.

<em>In the case of testing for significant difference, chi-square analysis cannot be used as testing for significant difference in two or more means requires using t-test, analysis of variance, or any other relevant statistical procedure.</em>

To compare number of knee injuries reported among four sports for significant difference, the most suitable statistical procedure would be analysis of variance.

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8 0
3 years ago
The rate of cellular respiration is regulated by its major product, ATP, via feedback inhibition. As the diagram shows, high lev
IrinaVladis [17]

Answer:

ATP levels would fall at first, decreasing the inhibition of PFK and increasing the rate of ATP production.

4 0
3 years ago
If adenine didn’t always pair with thymine and guanine didn’t always pair with cytosine, the new DNA ladders wouldn’t always be
zloy xaker [14]

Answer:

they wouldnt be identical because for example Guanine could be paired with thymine in the original DNA strand but could decide to pair with adenine in the replication DNA. that would make a different type of DNA.

Explanation:

DNA replication is a beautiful process. In DNA replication adenine only pairs with thymine and guanine only pairs with cytosine. this ensures that a replication of the DNA will be the same type of DNA.

Replication works like this. Helicase splits open the DNA and each side is copied by DNA polymerase. If let's say the nucleotide bases for side 1 are ATGCGA then the DNA polymerase will pair these with the matching bases TACGCT which will make the same DNA but if each base could pair with any base they want that could create a few different variations of the original DNA. ATGCGA could very well be paired with TCGACA or CGACTA which would created two different types of DNA.

3 0
3 years ago
What does the Solar System revolve around and how long does it take for one revolution?
mixer [17]

Answer:

Bottom line: The planets in our solar system orbit (revolve) around the sun, and the sun orbits (revolves) around the center of the Milky Way galaxy. We take about 225-250 million years to revolve once around the galaxy's center. This length of time is called a cosmic year.

Explanation:

3 0
3 years ago
The failure of chromosomes to separate during meiosis, resulting in an abnormal karyotype like the one shown, is called
Pavlova-9 [17]
The answer is non disjuction
4 0
3 years ago
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