Which of the following statements is true?
a. Presently, extinctions are occurring at a very slow pace.
b. Mutations, both contemporary and prehistoric, have been the single greatest cause of extinctions.
c. The fossil record indicates that there has been very little animal extinction until recently.
d. Evolutionary history is often represented by extinctions.
e. Organisms compete for limited resources in all environments, possibly leading to extinctions of some.
Ans: e. Organisms compete for limited resources in all environments, possibly leading to extinctions of some.
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Why is Caenorhabditis elegans an appropriate model organism for studying developmental processes?
A) C. elegans does not undergo programmed cell death B) C. elegans have meristems, regions that contain many stem cells C) C. elegans are transparent, and have only about 1000 cells, allowing the cells to be followed during development. D) C. elegans have millions of cells, but can be easily mutated to have no gastrulation. E) C. elegans have genes that are completely unique from mice and humans.
The transfer of DNA fragments from a dead cell to a live, competent recipient cell that results in a changed recipient cell is termed ________.
A. transduction B. conjugation C. transformation D. mitosis E. transmission
Some researchers think H. floresiensis is a
more common early human with a genetic or nutritional disorder. What other early human was thought of this way when their fossils were first discovered? a. H. neanderthalensis b. H. erectus c. H. sapiens d. H. ergaster e. H. habilis
Humans have a maximum of two types of cones
____________________ Indicate whether the statement is true or false.