In human oogenesis, how many chromosomes does a secondary oocyte carry?
A) 22
B) 23
C) 44
D) 46
E) 92
B) 23
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Which of the following factors would tend to increase membrane fluidity?
A) a greater proportion of unsaturated phospholipids B) a greater proportion of saturated phospholipids C) a lower temperature D) a relatively high protein content in the membrane E) a greater proportion of relatively large glycolipids compared with lipids having smaller molecular masses
The exoskeleton of insects is composed mainly of what material?
A. chitin B. calcium carbonate C. hydroxyapatite D. collagen E. waxes
Previously unidentifiable microorganisms have now been identified through ______
A) proteomics B) transcriptomics C) metagenomics D) evolutionary genomics E) reverse tTranscription
During the spring, you are studying the mice that live in a field near your home. There are lots of mice in this field, but you realize that you rarely observe any reproductive females. This most likely indicates
A) that there is selective predation on female mice. B) that female mice die before reproducing. C) that this habitat is a good place for mice to reproduce. D) that you are observing immigrant mice. E) that the breeding season is over