Who discovered penicillin?
A) Fleming
B) Ehrlich
C) Kitasato
D) Pasteur
E) Domagk
A
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Which of the following statements is FALSE? Saturated fats _____
A) are more common in animals than in plants B) have many double bonds in the carbon chains of their fatty acids C) usually solidify at room temperature D) contain more hydrogen than unsaturated fats that consist of the same number of carbon atoms
Why is it necessary to take special safety precautions when using radioactivity?
A. Radioactive substances decay. B. Radioactive substances will perforate plasma membranes. C. Radioactive substances will ionize cells. D. Radioactive substances have the potential to cause damage to living cells.
Answer the following questions true (T) or false (F)
1. When a virus takes over the machinery of a cell, it forces the cell to manufacture more viral particles. 2. Bacteria are considered to be a type of protist. 3. The simplest eukaryotes are the bacteria.
Which statement defends the concept that the term "gene" is better defined as a nucleotide sequence that encodes for one or more functional products rather than encoding for one or more functional proteins?
A. Products of genes include ribonucleotides as well as proteins. B. Genes in bacteria are organized as operons that can lead to several protein products. C. Intron sequences in DNA do not encode proteins. D. The genetic code is redundant, therefore the same codon may be encoded by different DNA triplets.