The first cells were most likely heterotrophic anaerobes because:a
they were dependent upon cyanobacteria for oxygen.
b. they manufactured organic molecules and needed oxygen.
c. they manufactured organic molecules and do not need oxygen.
d. they utilized preformed organic molecules and needed oxygen.
e. they utilized preformed organic molecules and did not need oxygen.
e
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The process of fertilization joins male and female gametes ____
a. randomly b. that contain a greater number of paternal chromosomes
c. that contain a greater number of maternal chromosomes d. with the fewest mutations e. with the best adaptive traits
You add a large amount of XFF to cultured alien liver cells. Which of the following would confirm that XFF is the alien equivalent of human epinephrine?
A) increased cell division B) decreased cell division C) glycogen breakdown D) increased glucose uptake E) insensitivity to insulin
The difference between a pre-mRNA and a mature eukaryotic mRNA is __________
a. the 5' and 3' ends have been modified in mRNA b. the removal of the leader sequence from the pre-mRNA c. the fact that all introns have been spliced out in the mRNA d. Both a and c e. All of the above
A particular variant of the lambda bacteriophage has a DNA double-stranded genome of 51,365 base pairs. How long would this DNA be?
What will be an ideal response?