What cells make antibodies?
What will be an ideal response?
plasma B cells
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Several species of sea urchins may inhabit the same tide pool and their reproductive periods overlap. Although they practice external fertilization, they seldom interbreed because eggs produce chemicals that are only attractive to sperm of their own species. This is an example of a _________ barrier that _______________.
A. prezygotic; causes geographic isolation B. prezygotic; causes temporal isolation C. prezygotic; prevents gamete fusion D. postzygotic; prevents zygote fusion E. postzygotic; causes hybrid infertility
Directional, light-triggered plant development is known as
A. thigmotropism. B. phototropism. C. thigmonasty. D. photomorphogenesis. E. acid-growth movement.
Multiprotein complexes known as ________ minimize diffusion distances and facilitate electron flow between electron transport complexes
Fill in the blank with correct word.
During gametogenesis, what percentage of gametes would be trisomic if the nondisjunction event occurs during meiosis II?
What will be an ideal response?