All of the following statements about the periplasmic space are true except:
A. It contains hydrolytic enzymes and binding proteins involved in nutrient acquisition.
B. It is located between the plasma membrane and outer membrane of gram-negative bacteria.
C. It is found only in gram-positive bacteria.
D. All of the choices are true.
Answer: C
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Choose the true statements about the diversity of Darwin's finches on the Galápagos Islands. Check all that apply.
_____ All of the finch species share a common ancestor that colonized the islands. _____ Prior to the adaptive radiation of finches, there were no unoccupied habitats in the Galápagos Islands. _____ Competition among finches for food sources led to character displacement of beak shapes. _____ Beak shape is not an important key innovation.
The most important events in human development occur during the ____
a. week before birth b. month before birth c. first trimester d. second trimester e. third trimester
Many errors made during DNA replication are corrected during DNA replication through proofreading by ____.
a. DNA polymerase b. primase c. telomerase d. DNA ligase e. helicase
Discuss how two of the following alter allele frequencies in populations: nonrandom mating, genetic drift, gene flow,
and natural selection What will be an ideal response?