Which organelle would be more abundant in a sperm cell than a skin cell since it has to move?
a) mitochondria
b) ribosomes
c) chloroplast
d) nuclei
Ans: a) mitochondria
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In a study of Arabidopsis thaliana researchers determined that:
A. the levels of CO mRNA did not follow a circadian pattern. B. the levels of CO mRNA were high and in sync with the light period when day-lengths were long. C. CO proteins accumulated only in the dark. D. CO proteins are stabilized by dark periods when day lengths are short. E. photoreceptors show no indication of stabilizing CO protein.
DNA is recognized as a left-handed molecule
Indicate whether the statement is true or false
The tube-like structures extending from these
bacterial cells in the picture above to the underlying cells in the above figure are used for a. attachment. b. locomotion. c. whipping up proteins. d. breathing. e. communication
Mutagenic studies of the promoter region of the ?-globin gene indicate that some areas are more likely than mutations in other areas to affect transcription rates
When mutations occur in consensus sequences (modular elements such as GC box, CAAT box, TATA box), does transcription increase or decrease?