E. coli O157:H7 and E. coli O111:H7 differ in their
What will be an ideal response?
Cell wall antigen.
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An organism that reproduces asexually produces genetically variable offspring
__________________ Indicate whether the statement is true or false.
A proton ________ drives the protons out across the mitochondrial membrane into the intermembrane space.
Fill in the blank(s) with the appropriate word(s).
The sex of the fruit fly Drosophila melanogaster is determined as follows: XX chromosomes give a female and XY give a male. The gene for bar eyes is recessive and located on the X chromosome. If a male with normal eyes is mated with a female who has normal eyes but is heterozygous,
A. all of the female offspring will have bar eyes. B. 1/2 the offspring will have bar eyes. C. 1/2 the males will have bar eyes. D. none of the offspring will have bar eyes.
Which situation could represent kin selection in action?
A) You help your friend learn linguistics, and your friend helps you learn biology. B) You help your brother pay for his children's college tuition, even though he may not be able to pay you back. C) You help your mother pay her property taxes when she gets old. D) You inexplicably forget to use birth control, and a child results.