Which of the following choices places the steps of hemostasis in the correct sequence?
a. smooth muscle in the vessel wall contracts plasma proteins form a clot platelets stick together
b. platelets stick together plasma proteins form a clot smooth muscle in the vessel wall contracts
c. plasma proteins form a clot smooth muscle in the vessel wall contracts platelets stick together
d. smooth muscle in the vessel wall contracts platelets stick together plasma proteins form a clot
d
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In a newly fertilized egg, the vitelline layer _____
A) opens the egg's nuclear membrane to allow haploid sperm DNA to enter B) lifts away from the egg and hardens to form a fertilization envelope C) secretes hormones that enhance steroidogenesis by the ovary D) reduces the loss of water from the egg and prevents desiccation E) provides most of the nutrients used by the zygote
Most microorganisms assimilate nitrogen as ________.
A. nitrite B. nitrate C. N2 D. hydrazine
Hypoxia results in all of the following EXCEPT
a. hyperventilation. b. respiratory muscles working harder. c. heart muscles working harder. d. breathing difficulty. e. excessive oxygenation of the blood.
Which question relates to population genetics and could be answered using the Hardy-Weinberg equation?
A) What will be the frequency of a particular genotype in a future generation? B) What is the probability that members of two groups will mate? C) Is an allele dominant or recessive? D) What is the genetic basis of racial categories?