Why is the separate types hypothesis considered so unlikely by most biologists?
A) If different types of life evolved independently, it would be obvious in the fossil record.
B) There are multiple similarities in all life at the cellular level that strongly suggest a common origin for all living things.
C) The separate types model hypothesizes many changes in living things over time, while the fossil record suggests that few of these changes have occurred.
D) The similarity in appearance in many living things suggests that there must have been only one common ancestor.
B
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Nearsightedness is also called
(a) myopia. (b) hyperopia. (c) presbyopia. (d) none of the above
Which of the following questions is about gene regulation? Select all correct choices
A. Why do all eukaryotes share a common genetic code? B. Where are genes for hemoglobin expressed? C. How much insulin is produced after a meal?
The letter “A” in the above figure represents which
teeth? a. incisors b. molars c. canines d. premolars e. none of these
Disadvantages of continuous cell cultures include
A) they only grow for a limited number of generations. B) the expense of preparation. C) they may be significantly different genetically from the original source animal. D) viruses do not reliably infect them. E) they are both expensive and have a limited number of division.