Which one of the following is a problem associated with traditional vaccines as opposed to vaccines produced by transgenic organisms?
A) Traditional vaccines are always in short supply.
B) Traditional vaccines may result in disease symptoms because they contain killed or weakened organisms.
C) Traditional vaccines can only be given after infection; they cannot prevent infection.
D) Traditional vaccines must be given in larger quantity.
E) Traditional vaccines are more expensive.
B
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Which of the following statements is true regarding steroid hormones? Select all correct choices
A. They are hydrophilic B. They are hydrophobic C. They have structures similar to cholesterol D. They are composed of single aromatic amino acids E. They bind to cell surface receptors F. They bind to cytoplasmic receptors
The lock-and-key fit of the genitalia of many male and female insects of the same species is an important part of ensuring reproductive success. Which of the following statements provides an explanation for the fit and shape of insect genitalia?
A. In order to achieve high reproductive success males choose to have genitalia that fit only into the reproductive tracts of females from different species so that they can start new species. B. In order to be successful on land and ensure fertilization, males choose genitalia that only fit into female genitalia of the same species. C. Success in terrestrial environments was increased because sperm were deposited within a female of the same species and increased the probability of fertilization. D. Success in terrestrial environments was increased because males who deposited sperm within females helped to ensure survival of the species once they had colonized land.
Which of the following was not considered part of the "alphabet of biochemistry" by George Wald?
A) the 20 amino acids B) the 5 nucleotide bases C) two sugars D) three lipids E) seven proteins
A transposon may carry genes for proteins that enable their transposition as well as genes for other functions such as drug resistance
Indicate whether the statement is true or false