The enzyme responsible for joining Okazaki fragments together during DNA replication is
A. DNA polymerase.
B. helicase.
C. topoisomerase II.
D. DNA ligase.
E. DNA replicase.
D
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Mammals have a family of 500 and 1000 genes that encode receptor proteins on the surface of odor-receptor neurons. If all mammals have these genes, why do some mammals have a better sense of smell than others do?
A) Some of the genes actively transcribing receptor proteins in some species are completely absent in other species. B) Some of the genes may have been mutated and rendered inactive in some species but not in others. C) Some species, particularly humans, rely much less on odor detection for survival; thus, the genes have mutated to encode proteins that aid in other senses, such as sight. D) Some species of mammals have a larger set of "basic odors" than other species.
The term monoecious is best described as referring to the flower in what way?
A. It refers to the number of flower parts. B. It describes where the parts are located. C. It has nothing to do with flower parts. D. It refers to the carpellate and staminate parts. E. It means there are missing parts on the flower.
Bees are currently suffering from disease, and population numbers are decreasing. What is a likely consequence for flowers if this continues?
1.There would be no need for stamens for pollination, so flowers would evolve with just carpels.
2.Other insects would take over the role of pollination for the plant.
3.Plants could go extinct if there isn’t any pollination by other organisms.
4.The plant would be forced to rely on wind for pollination.
Which of the following statements is FALSE?
A) The more highly evolved a species is, the more chromosomes it possesses. B) The number of chromosomes is the same for all members of a species. C) Germ cells contain half as many chromosomes as somatic cells. D) The number of chromosomes remains constant throughout a life cycle. E) More than 1,000 chromosomes are found in some organisms.