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; prevents gamete fusion
B. postzygotic; prevents zygote fusion
C. postzygotic; causes hybrid infertility
D. prezygotic; causes geographic isolation
E. prezygotic; causes temporal isolation
Answer: A
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A. ATP synthase B. helicase C. DNA polymerase D. DNA ligase
Peripheral chemoreceptors are specialized cells in contact with arterial blood that respond directly to changes in blood
A) pH. B)PO2. C) PCO2. D) PCO2 andPO2. E) PO2, pH, andPCO2.
produces sodium bicarbonate to neutralize stomach acid, produce enzymes to break down all types of food
What will be an ideal response?
ATP is produced mostly by the electron transport located in ____ of a human breast cancer cell
a. plasma membrane b. peptidoglycan c. inner mitochondrial membrane d. mitochondrial matrix