Females outnumber males in the tertiary sex ratio because genetic and ____________________ factors cause higher
death rates among males Fill in the blank(s) with the appropriate word(s).
environmental
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The difference between normal and sickle-cell
hemoglobin is based upon a. the number of amino acids in the molecule. b. the substitution of one amino acid for another. c. the number and orientation of the amino acid chains attached to the heme portion of the molecule. d. the number of oxygen molecules that can be carried. e. the type of bone marrow that produces it
Infant respiratory distress syndrome is caused by
a. surfactant-secreting cells that do not work yet. b. underdeveloped alveoli. c. clogged bronchioles. d. underdeveloped bronchi. e. small lungs.
Which of the following is true about glycosylated plasma membrane proteins?
A) Carbohydrate is added only after the protein is in the plasma membrane. B) The carbohydrate usually is one sugar and rarely more than 5 sugars long. C) Only one specific site is glycosylated on each protein. D) N-linked carbohydrates are linked to hydroxyl groups in protein R groups. E) The carbohydrates can be detected experimentally with ferretin-linked lectins.
Angiosperms produce pollen in structures called ________
Fill in the blank(s) with correct word