When the Darwin/Wallace theory of natural selection is summarized, four central postulates emerge. Which of the following is NOT one of these four natural selection postulates?
A) Variations exist in any given generation of a species.
B) Variations in traits are produced by mutations.
C) Variations are, at least in part, heritable.
D) Those individuals whose variations confer an advantage are more likely to survive and reproduce.
B
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In rapidly dividing cells, expression of BRCA1 and BRCA2 genes is the highest during the ____
a. mitosis to cytokinesis transition b. G1/S transition and into S phase c. G2/mitosis transition d. S/G2 transition e. metaphase to anaphase transition
Meningoencephalitis and African sleeping sickness are both caused by protozoans
Indicate whether this statement is TRUE or FALSE.
What may have been a site for the synthesis of organic molecules on the early Earth with its source of hot water and metal ions from rocks?
a. dried-out mud flats b. stratified mica crystals c. deep sea hydrothermal vents d. the bottoms of tidal pools e. pockets in lava beds
What explains the increased concentration of Ca++ in the ER?
A) Calcium ions are actively imported from the cytoplasm into the ER. B) Calcium concentration is kept low in the cytoplasm because of its high usage level. C) Calcium cannot enter the plasma membrane through ion channels. D) Calcium levels in the blood or other body fluids are extremely low. E) The Ca ions are recycled from other molecules in the ER.