The time between inoculation and the beginning of growth is usually called the
A) lag phase.
B) log phase.
C) dormant phase.
D) death phase.
Answer: A
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The DNA-binding proteins of almost all regulatory proteins use one of a small set of shapes that enable them to fit into the DNA major groove. These shapes are called
A. structural motifs. B. DNA prints. C. fingerprints. D. repressors. E. transcriptional domains.
In rabbits, there are four alleles at the c locus. Arranged in dominance sequence they are:C
(agouti), cch (chinchilla), ch (Himalayan), and c (albino) (a) Is it possible to cross two agouti rabbits and produce both chinchilla and Himalayan offspring? (b) Is it possible to cross two chinchillas and produce 1/2 chinchilla and 1/2 Himalayan? What will be an ideal response?
In forensics, the laws in the United States and elsewhere allow the establishment of databases of PCR amplification of short tandem repeats (STRs) of the Y chromosome
Which of these statements would provide an appropriate basis for making such databases divided by ethnicity? A) Different heritage groups have different levels of such polymorphisms. B) It would be easier to evaluate suspects of different ethnicities. C) It would show detectives which ethnic category they should be looking for. D) Most crimes of certain types are found among certain groups. E) Y polymorphisms increase with the probability of criminal behavior.
An operon is defined as:
a. a group of structural genes, with no regulatory sequences. b. regulatory sequences upstream of a structural gene. c. a group of related structural genes, plus their associated regulatory sequences. d. one structural gene plus one regulatory gene. e. a group of unrelated structural genes, plus their associated regulatory sequences.