Modern cells are thought to have arisen from ____
a. protocells
b. pre-cells
c. gas and dust clouds
d. prokaryotic cells that predated protocells
e. prokaryotic cells that predated pre-cells
ANSWER: a
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Female preference for brightly colored blue or
red males in Lake Victoria provides an example of
a. sympatric speciation. b. sexual selection. c. allopatric speciation. d. behavioral isolation. e. a combination of more than one of these.
Which of the following statements is FALSE with regard to DNA replication?
a. DNA synthesis proceeds in the 5’->3’ direction. b. The strand being copied is read in the 5’->3’ direction. c. Both strands replicate at the same time. d. The position of the replication fork is constantly moving. e. Two identical DNA polymerase molecules catalyze replication.
Membrane proteins
What will be an ideal response?
What conclusions can be made of a five-fingered child born to polydactylous parents, a dominant trait characterized by extra fingers?
A) a mutation reversed the allele to its normal state in either of the parents' gametes B) polydactyly must not be a genetic condition C) the parents were both heterozygous for the condition D) the environmental factors favoring the development of polydactyly were absent for the child E) polydactyly must result from an epistatic interaction