Which of the following molecules is NOT DIRECTLY involved in translation?

a. DNA
b. mRNA
c. ribosomes
d. tRNA
e. All of the above molecules are directly involved in translation.


Ans: a. DNA

Biology & Microbiology

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A microbiologist studying the human microbiome is interested in how a particular bacterial species may impact water absorption in the large intestine. Which of the following models is appropriate for this investigation?

A. A normal mouse colonized with enteric microbiota found in the human colon. B. A germfree mouse inoculated with human microbiota shortly after birth. C. A human volunteer who is a carrier of that particular bacterial species. D. A germfree mouse raised in a sterile environment.

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What cellular structure assembles amino acids

into polypeptides?

a. Golgi bodies b. mitochondria c. ribosomes d. centrioles e. lysosomes

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Baker's yeast or ________ are ethanol-fermenting yeasts commonly used when making bread and pizza dough

A) Lactobacillus delbrueckii B) Saccharomyces cerevisiae C) Thermus aquaticus D) Streptococcus thermophilus E) Aspergillus niger

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What is a simple way for determining if an annelid is a member of  Errantia (a polychaete) or Sedentaria (a clitellate)?

A. Possession of a closed circulatory system B. The layout of the digestive system C. The amount of chaetae (setae) D. The number of segments

Biology & Microbiology