In the DNA isolation process, detergent was used to stabilize
a. the cellular and nuclear membranes.
b. emulsify cellular and nuclear membranes.
c. homogenize the cellular and nuclear membranes.
d. neutralize the cellular and nuclear membranes.
e. liquify the cellular and nuclear membranes.
Answer: b. emulsify cellular and nuclear membranes.
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Which is false regarding the two-component regulatory system in bacteria?
A. One part of the system is exposed to the external cellular environment while another part is exposed to the cytoplasm. B. The system involves a sensor kinase and a response regulator. C. The sensor kinase is phosphorylated by the response regulator when the extracellular environment changes. D. Regulation of OmpF and OmpC porin proteins in E. coli is modulated by this type of system.
The genetic molecular material that has been spliced together from multiple organisms is
A. any specific protein produced from a gene. B. a zygote. C. RNA transcriptase. D. both (either) RNA transcriptase and any specific protein produced from a gene. E. recombinant DNA.
A reddish chemical, lipofuscin, is found in greater quantities in cells of older people than in those from younger people. This chemical should be broken down in the cells. Which specific type of organelle is not working as well in the seniors?
A) lysosome B) mitochondrion C) nucleus D) rough endoplasmic reticulum
A facultative anaerobe can perform both aerobic and anaerobic respiration?
a. true b. false