A mutualism in which each species can live without the other is termed
A. an obligate mutualism.
B. a facultative mutualism.
C. a dispersive mutualism.
D. a trophic mutualism.
E. a defensive mutualism.
Answer: B
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A competitive inhibitor
A) binds at a site other than the active site. B) irreversibly binds and inactivates the enzyme. C) cannot be processed by the enzyme. D) does not inhibit enzyme activity but does lower substrate concentration. E) binds to and inactivates the substrate.
When a female has low levels of estrogen and progesterone, ________
A) she is ovulating B) her uterus is ready to accept an embryo C) she is pregnant D) she is menstruating
Mutations are important to the evolution of a species because they
a. accelerate the transcription rate of DNA b. are a source of genetic variability c. happen over the long period of time that evolution requires d. cut out and replace damaged or useless genes
Refer to the paragraph on Brown et al. and Morwood et al. It is speculated that H. floresiensis and H. sapiens may have lived on Flores concurrently
Suppose researchers obtained mitochondrial DNA samples from the H. floresiensis remains, amplified a 1000-base-pair sequence via PCR, and compared it to that of several currently living H. sapiens native to Indonesia, North Africa, and North America. Also suppose H. floresiensis were found to differ from the average Indonesian H. sapiens in 28 base pairs, from the average North African H. sapiens in 51 base pairs, and from the average North American H. sapiens in 53 base pairs, while two randomly selected H. sapiens differed from each other in an average of 21 base pairs. What would you surmise from these data? A) H. floresiensis and H. sapiens probably did not live on Flores concurrently. B) H. floresiensis and H. sapiens probably lived on Flores concurrently but did not interact. C) H. floresiensis and H. sapiens probably lived on Flores concurrently, and H. sapiens killed and consumed H. floresiensis. D) H. floresiensis and H. sapiens probably lived on Flores concurrently and interbred to some degree.