Which type of RNA molecule contains the genetic code of a gene that is read by ribosomes during translation?
A) rRNA
B) tRNA
C) siRNA
D) mRNA
E) miRNA
D
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What happens when living R strain Streptococcus pneumoniae bacteria are mixed with heat-killed S
strain Streptococcus pneumoniae bacteria?
a. The S strain bacteria come back to life. b. The R strain bacteria are killed, and the S strain bacteria remain dead. c. The R strain bacteria are transformed into S strain bacteria. d. The S strain bacteria are transformed into R strain bacteria. e. The R strain bacteria are killed, and the S strain bacteria come back to life.
Which of the following statements would not be consistent with the theory for the endosymbiotic origin of mitochondria and chloroplasts?
A. Genes encoded within mitochondria and chloroplasts indicate a closer relationship to prokaryotes than do most nuclear genes. B. The composition of the outer membrane of chloroplasts and mitochondria is similar to the plasma membrane of eukaryotic cells. C. Mitochondria and chloroplasts have some enzymes unique to them. D. Mitochondria and chloroplasts have their own DNA enclosed within a nuclear envelope. E. The composition of the inner membrane of chloroplasts and mitochondria is similar to the plasma membrane of prokaryotic cells.
Who discovered the first antimicrobial widely available to the general public?
A. Domagk B. Ehrlich C. Fleming D. Waksman E. Ehrlich and Waksman
Answer the following statements true (T) or false (F)
1. The cell is the basic structural/functional unit common to all living organisms. 2. Resolution, contrast, and magnification are three important parameters in microscopy. 3. Fluorescence microscopy enables researchers to label and visualize a particular type of cellular protein or organelle. 4. The flagellum is used for cell motility in eukaryotes only.