Why are conditional knockout animals desirable?
A) Genes that are essential for development can be deleted in the adult or only in specific tissues.
B) Animal cell lines with deletions can be created.
C) They are easier to create than standard knockout animals.
D) The mutations they create are more stable than those created by standard knockout techniques.
A) Genes that are essential for development can be deleted in the adult or only in specific tissues.
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What role did cyanobacteria play in shaping Earth’s environment?
a. They are single-celled organisms that are detritivores. b. They produced oxygen, which led to changes in Earth’s atmosphere. c. They evolved into the first plants that colonized land. d. They are the ancestral form of all life on Earth
In most eumetazoans, the middle tissue layer during development is the ____
a. mesoderm b. epiderm c. mesoglea d. endoderm e. ectoderm
Which of the following are NOT structures by which viruses adhere to their host cells?
a. Capsule b. Spikes c. Fimbriae d. Slime layer
Matching. Choose the one most appropriate answer
for each. 1. ___ conservation biology 2. ___ coral reef 3. ___ ecoregion 4. ___ endangered species 5. ___ habitat fragmentation 6. ___ habitat island 7. ___ habitat loss 8. ___ hot spot 9. ___ indicator species 10. ___ strip logging 11. ___ riparian zone A. a reduction in suitable places to live B. organisms that give an “early warning” signal of changes in biodiversity C. new method of harvesting trees to preserve diversity D. a field of research whose goal is conservation of biodiversity E. species vulnerable to extinction F. broad land or ocean region defined by climate, geography, and producers G. ocean structure of amazing biological complexity H. locations where species are in greatest danger of extinction I. a national park is an example J. narrow corridor of vegetation along a stream or river K. isolated patches of habitat; this describes an island such as Oahu