An organism that obtains its carbon from CO2 is a (an)
a. autotroph.
b. auxotroph.
c. heterotroph.
d. chemotroph.
e. phototroph.
A
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Which one of the following statements about translation in eukaryotes is incorrect?
A. An initiator codon is identified by recognizing a 5' cap structure and scanning for the first AUG triplet. B. Translation continues until one of the three stop codons appears in the A site of the ribosome. C. A single processed mRNA can possess multiple protein coding regions. D. There are untranslated regions at both the 5' end and 3' end of a processed mRNa. E. All of these statements about translation in eukaryotes are correct.
Which of the following traits of complex multicellular organisms is also shared by some simple multicellular organisms, but not by single-celled organisms?
A. plasmodesmata B. adhesion C. cell signaling D. bulk transport E. None of the answer options is correct.
A young dog has never had much energy. He is brought to a veterinarian for help and she decides to conduct several diagnostic tests
She discovers that the dog's mitochondria can use only fatty acids and amino acids for respiration, and his cells produce more lactate than normal. Of the following, which is the best explanation of the dog's condition? A) His mitochondria lack the transport protein that moves pyruvate across the outer mitochondrial membrane. B) His cells cannot move NADH from glycolysis into the mitochondria. C) His cells lack the enzyme in glycolysis that forms pyruvate. D) His cells have a defective electron transport chain, so glucose goes to lactate instead of to acetyl CoA.
The most successful way to achieve healthy weight loss is ________
A) gradually changing eating habits B) a severe restriction of calories C) using a diet supplement to enhance metabolism D) eating more meat