Ecosystems typically support which two types of food webs?
a. decomposing and detrital
b. producing and detrital
c. grazing and detrital
d. producer and consumer
e. grazing and hunting
ANSWER: c
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The Xist gene product
A. is never translated into protein. B. is required for the production of Barr bodies. C. coats the X chromosome with RNA. D. associates with proteins to compact the chromosome. E. All of these statements are correct.
The per capita growth rate of a population can be defined as
A. N. B. unchanging for a species. C. birth minus death. D. exponential growth. E. logistic growth.
The biochemical description of B. bronchiseptica is:
a. oxidase positive, motile, and rapid urease positive. b. indole positive, nonmotile, and has a fruity odor. c. resistant to vancomycin and will grow on MacConkey agar at 42°C. d. nonmotile and both urea positive and phenylalanine deaminase positive.
What is the consequence to a bacterial cell of a mutation that inactivates the enzyme responsible for methylating the A in the DNA sequence 5? GATC?
A) Replication of the lagging strand cannot be completed. B) Thymine dimers cannot be repaired. C) Parental and new DNA strands cannot be distinguished during mismatch repair. D) Expression of certain metabolic genes is decreased. E) The mutation rate of all genes will be lower.