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.
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?
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