A protein is being assembled when
a. DNA is being transcribed
b. RNA is being transcribed
c. DNA is being translated
d. RNA is being translated
Ans: d. RNA is being translated
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Genes for drug resistance may be present
A. on plasmids. B. on the chromosome. C. on mitochondrial DNA. D. both on the chromosome and on plasmids. E. both on plasmids and on mitochondrial DNA. F. both on the chromosome and on mitochindrial DNA.
CO2 and H2O will not form glucose on their
own because a. CO2 does not contain sufficient energy. b. H2O does not contain sufficient energy. c. neither CO2 nor H2O contain sufficient energy. d. the concentration of CO2 is too low in the atmosphere. e. the bonds of CO2 and H2O are too stable to be broken without an input of energy.
Which of the following statements about the immune system is correct?
a. Memory cells are involved in a primary immune response. b. Dendritic cells were first identified in the nervous system. c. Interferons are specific proteins that block cell replication at the level of mitosis. d. Natural killer cells are involved in both specific and nonspecific immune responses. e. Defensins are one type of protective protein synthesized by T helper cells.
Two small, poorly drained lakes lie close to each other in a northern forest. The basins of both lakes are composed of the same geologic substratum. One lake is surrounded by a dense Sphagnum mat; the other is not
Compared to the pond with Sphagnum, the pond lacking the moss mat should have _____. A) lower numbers of bacteria B) reduced rates of decomposition C) reduced oxygen content D) less-acidic water