According to the latest research, which of the following is the best description of the first eukaryote?
a. It lacked a nucleus, but contained a mitochondrion and a chloroplast.
b. It contained a nucleus, a mitochondrion, and a chloroplast.
c. It contained a nucleus and a chloroplast, but not a mitochondrion.
d. It contained a nucleus and a mitochondrion, but not a chloroplast.
Ans: d. It contained a nucleus and a mitochondrion, but not a chloroplast.
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Thioglycolate medium contains the following: yeast extract, pancreatic digest of casein, glucose, L-cysteine, sodium chloride, sodium thioglycolate, and agar. It is considered a complex medium because
A. depending on their oxygen utilization pattern, organisms will grow differently on it. B. thioglycolate has a carbon-sulfur bond that many microbes cannot break enzymatically. C. it has multiple ingredients for a broad range of nutrients. D. both yeast extract and pancreatic digest of casein are not chemically defined.
Cells get their energy from the ________ of molecules, such as ATP, that store energy
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Which of the following parts of an amino acid vary among different amino acids?
A. the carboxyl group B. the side chain, or R group C. the amino group D. the hydrogen on the central carbon
________ is caused when a woman drinks heavily throughout her pregnancy
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