Answer: a light microscope is likely the answer they are after (can get to micrometer range)
an electron microscope is even more powerful it can get into the nanometer range
Explanation:
Answer:
The correct option is b. 0.453
Explanation:
To calculate the coefficient of coincidence, CC, we must use the next formula:
CC= observed double recombinant frequency/expected double recombinant frequency
<u>Note</u>:
• <em>Observed double recombinant frequency=total number of observed double recombinant individuals/total number of individuals
</em>
<em>• Expected double recombinant frequency: recombination frequency in region I x recombination frequency in region II.
</em>
CC= (7/1000)/0.16x0.08
CC= 0.007/0.0128
CC=0.5468
The coefficient of interference, I, is complementary with CC.
I = 1 - CC
I = 1 - 0.5468
I = 0.4531
Answer:
Louis Pasteur, by observing that the microbes were in the air and contaminated the broth helped determine that all the cells came from pre-existing cells (option b), one of the postulates of the cell theory.
Explanation:
Louis Pasteur's experiments, conducted around 1860, showed that unicellular organisms appeared in a culture broth only if it was exposed to the air, where other microorganisms were present, thus disproving the hypothesis of spontaneous generation.
On the other hand, in the broth that was not exposed to the air Pasteur did not observe microorganisms.
By rejecting the hypothesis of spontaneous generation through his experiment, Louis Pasteur reaffirmed the postulate of the cell theory that proposes that all cells come from preexisting cells.
The other options are not correct due to:
<em> a and c. </em><em><u>All animals are made of cells
</u></em><em> and </em><em><u>cell is the basic functional unit of living things</u></em><em> are postulates of the cellular theory that were not demonstrated by Pasteur's experiment.</em>
<em> d. </em><em><u>Unicellular organisms inherit an exact copy of DNA from the parent cell</u></em><em> is not a postulate of cell theory.</em>
Scientists have suggested that these examples of gigantism are possible because of the extreme cold found in these waters.
Answer:
c The gene is silenced on the Y chromosome.
