Eukaryotes are first seen in the fossil record ________ years ago.
A. 2 million
B. 1.7 billion
C. 200,000
D. 10 million
Answer: B
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The fluid nature of the membranes is attributed to a lateral movement of
A. protein channels. B. phospholipid molecules. C. antigen molecules. D. pumps such as the proton pump. E. the entire lipid bilayer.
In some instances environmental change causes a situation where one phenotype is favored for a period of time, and then a different phenotype is favored. This oscillating selection causes
A. the maintenance of genetic variation in the population. B. an increase in point mutations. C. elimination of rarer genotypes because of uneven selection. D. extinction of the population. E. high population increase to maintain phenotypic variation.
The most extensive of the biomes is the ____
a. temperate deciduous forest b. chaparral c. tropical rainforest d. temperate grassland e. boreal forest
Where in cells are proteins manufactured?
a. Golgi bodies b. vesicles c. rough endoplasmic reticula d. lysosomes e. smooth endoplasmic reticula