The typical osmolarity of body fluids in most marine invertebrates is
a. ~5 mOsm/L.
b. ~225 mOsm/L.
c. ~300 mOsm/L.
d. ~1000 mOsm/L.
e. ~1500 mOsm/L.
D
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The disease, sickle-cell anemia is common in malaria-infested areas because individuals that are heterozygous for the gene (AS) have enhanced resistance to malaria over normal individuals (AA). Individuals with severe sickle-cell anemia (SS) usually die before reproduction. If this population moves to an area without malaria, what will happen to the allele frequency of the A allele over time?
A. It will go up because there is no sickle cell anemia. B. It will go down because there is no malaria. C. It will go down because there is no sickle cell anemia. D. It will go up because there is no malaria.
In the waiting room of a doctor's office, the staff are creating an educational display about varieties of birth control. What general categories of birth control will they want to outline?
_____ drugs that block gonad development _____ devices to prevent implantation _____ hormones to close cervix _____ hormones to prevent ovulation _____ hypothalamic implants _____ nasal spray for males _____ sperm barrier _____ sperm destruction _____ surgical sterilization _____ abstinence
Small bronchioles contain ________.
A. smooth muscles B. cartilage rings C. cilia D. two of the above
According to Mendel, if a male that is homozygous for the dominant form (PP) of a trait is crossed with a female that is homozygous for the recessive (pp) form of a trait, all offspring will show the ____ form of the trait.
A. sex-linked B. dominant C. recessive D. codominant E. lethal