Primary metabolites
A. are compounds needed for the synthesis of microbial cells in the primary growth phase.
B. are compounds that accumulate during the period after primary growth phase and have no direct relationship to the synthesis of cell materials.
C. include bacteriocins and other similar cytotoxic compounds.
D. include compounds such as antibiotics and mycotoxins.
Answer: A
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A new mutation disrupts the expression of Distal-less in one individual of a butterfly species. This individual will likely
_____ develop similar to other butterflies of the same species. _____ develop deformed limbs. _____ develop asymmetrical or missing eyespots. _____ develop deformed antennae.
Which of the following best describes why the disks rose to the surface faster in the more concentrated hydrogen peroxide solutions?
a. There was more enzyme present in the more concentrated solutions. b. A greater amount of heat was generated in the more concentrated solutions. c. The more concentrated solutions lowered the activation energy of the reaction. d. The higher substrate concentrations in the more concentrated solutions speeded the reaction. e. The density of the water was lower in the more concentrated solutions.
The various techniques by which scientists manipulate DNA in the lab are called
A. gene probes. B. genetic engineering. C. biotechnology. D. recombinant DNA. E. gel electrophoresis.
Intragenic recombination can be detected __________
A) based on recombination between homologs carrying different mutant alleles B) by the recovery of 100% double-mutant chromosomes C) by the recovery of both wild-type and double-mutant chromosomes D) based on recombination between homologs with different mutant alleles and recovery of 100% double-mutant chromosomes E) based on recombination between homologs with different mutant alleles and recovery of both wild-type and double-mutant chromosomes