The level of the oceans is rising due to:
a. ozone depletion.
b. global warming.
c. lost species biodiversity.
d. increased precipitation.
e. acid rain.
B
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Chaperones mediate nucleosome assembly. From the list below, what must happen first?
A. The CAF-1 chaperone binds an H3-H4 dimer and deposits it onto the DNA strand. B. H3 and H4 form heterotetramers. C. The NAP-1 chaperone assembles two H2A-H2B heterodimers with a H3-H4 tetramer. D. The CAF-1 chaperone binds an H2A-H2B dimer and deposits it onto the DNA strand.
The structure between the carpel and stigma is the ____
a. stamen b. sepal c. style d. ovary e. anther
Transgenic animals are valuable in the study of human diseases for which of the following reasons?
A. They can manifest the same symptoms as human diseases. B. They can be used to study the development and progress of human diseases. C. They can be used to test drugs on. D. They can be cloned and thus have identical genomes. E. All of these are reasons why transgenic animals are valuable in the study of human diseases.
Although the Arctic fox and the kit fox are closely related, they look very different because the individuals
A. acquired traits during their lifetimes that contributed to survival B. with traits most suited to their environments reproduced most successfully C. migrated long distances to environments that most suited their traits D. passed on to their offspring acquired behaviors that were helpful