A scientist discovered a new antibiotic and wanted to know if it would be effective against group A Streptococcus bacteria. He d
esigned a test experiment in a lab with ten different cultures of the bacteria. He introduced the antibiotic into five of the cultures, leaving the other five to grow without it. He recorded observations every three hours for a week. What is the independent variable in this experiment?
A.
the total number of bacteria cultures
B.
the presence of the new antibiotic
C.
the reaction of the bacteria to the antibiotic
D.
the presence of the Streptococcus bacteria
An experiment is a process where the a scientist tests and draws their evidence and data from. Hence, this process is where the hypothesis be supported or negated.
Variables are traits, factors, or characteristics that either manipulated or measured being the subject to become the data. The independent variable is B. <span>the presence of the new antibiotic</span>
They are useful as they can predict the genetic probability of a particular phenotype arising in a couple's offspring. In other words, it can tell you if you will or will not have a certain trait.
Exocytosis is the reverse of endocytosis. <em><u>Quatities of material are expelled from the cell without ever passing through the membrane as individual molecules.</u></em> By using the processes of endocytosis and exocytosis, some specialized types of cells move large amounts of bulk material into and out of themselves.
A magnifying glass (called a hand lens in laboratory contexts) is a convex lens thatis bigto produce a magnified image of an object. The lens is usually mounted in a frame with a handle
A codon is a tree letter nucleotide sequence in the mRNA. The tRNA anticodon attached to the corresponding amino acid recognizes the mRNA codon. A single amino acid can have more than one codon.
