Before biotechnology, human proteins used in treatment of diseases were
A. not available.
B. synthesized chemically.
C. substituted for by similar animal proteins.
D. harvested from blood or cadavers.
E. substituted for by similar animal proteins and harvested from blood or cadavers only
E
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About thirteen different species of finches inhabit the Galàpagos Islands today, all descendants of a common ancestor from the South American mainland that arrived a few million years ago
About thirteen different species of finches inhabit the Galápagos Islands today, all descendants of a common ancestor from the South American mainland that arrived a few million years ago. Genetically, there are four distinct lineages, but the thirteen species are currently classified among three genera. The first lineage to diverge from the ancestral lineage was the warbler finch (genus Certhidea). Next to diverge was the vegetarian finch (genus Camarhynchus), followed by five tree finch species (also in genus Camarhynchus) and six ground finch species (genus Geospiza). If the six ground finch species have evolved most recently, then which of these is the most logical prediction? A) They should be limited to the six islands that most recently emerged from the sea. B) Their genomes should be more similar to each other than are the genomes of the five tree finch species. C) They should share fewer anatomical homologies with each other than they share with the tree finches. D) The chances of hybridization between two ground finch species should be less than the chances of hybridization between two tree finch species.
The major histocompatibility complex directs the production of proteins called
A. class IV. B. class II. C. class I. D. both class I and class II. E. both class I and class IV.
What is the site of cleavage?
a. Ovary b. Vagina c. Cervix d. Uterus e. Oviduct
Girdling a tree is eventually lethal because it prevents
a. water uptake. b. photosynthesis. c. respiration. d. sugar transport to roots. e. water transport to leaves.