Before the publication of Charles Darwin's On the Origin of Species, what was the prevailing public consensus regarding species evolution?
A. That species evolved through physical changes that led to success
B. That species were permanent and unchanging
C. That species were modified over time but did not change into new species
D. That species evolved by means of natural selection
Answer: B
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The obvious advantage of the lactose operon is that it
a. allows bacteria to survive in the presence of lactose. b. eliminates the need for lactose-metabolizing enzymes when lactose is not present. c. enables bacteria to make lactose only in the presence of the proper enzymes. d. negates the need for milk in the diet of adult humans. e. enables glucose to substitute for lactose in the diet of lactose intolerant persons.
Answer questions 114–118 in reference to the five eye structures
listed below. a. cornea b. lens c. retina d. ommatidium e. vitreous body D 114. This structure is found in the compound eyes of insects but not in the eyes of vertebrates. M 115. This structure forms the transparent front of the eye. E 116. This structure primarily acts to focus light waves. M 117. This structure contains rods and cones in vertebrates. M 118. This structure acts to maintain the shape of the eye and to transmit light to other structures.
Sharks
Select one: a. have bone skeletons. b. lack jaws. c. have a keen sense of smell. d. lack the lateral line system of bony fishes. e. do not have paired fins.
Spectral karyotypes take advantage of which of the following?
A) Probes can be made with different radioactive isotopes. B) Probes can be labeled with different color fluorophores. C) Chromosomes can be labeled with different radioactive isotopes. D) Chromosomes are different colors under a microscope.