Which of the following can result in instant speciation?
a. development of a physical barrier
b. polyploidy
c. increase in physical size
d. change in environmental conditions
e. the introduction of a new predator into an area
b
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Scientists speculate that extinctions did not occur in Africa as they did on other continents because animals coevolved with _______ in Africa.
A. plants B. diseases C. parasites D. humans
The nucleotides within DNA are composed of a
A. phosphate group, ribose sugar, and nitrogenous base. B. sulfur group, ribose sugar, and nitrogenous base. C. phosphate group, deoxyribose sugar, and nitrogenous base. D. sulfur group, deoxyribose sugar, and nitrogenous base. E. phosphate group, hexose sugar, and nitrogenous base.
Color vision:a
is limited to vertebrates. b. depends on blue, green, and red cones in primates. c. is the result of different concentrations of the photopigment rhodopsin. d. results from the integration of responses within the optic nerve. e. depends on four types of cones in mammals other than primates
Answer the following questions true (T) or false (F)
1. Currently, there are no cures or preventions for autoimmune disorders. 2. An allergen is any antigen that triggers IgE production and leads to a scenario where the immune system fights off a perceived threat that would otherwise be harmless. 3. An allergy is a scenario where the immune system fights off a perceived threat that would otherwise eventually cause the breakdown of skin or other localized tissue.