Which of the following statements is true of filtration by the kidneys?
a. About 25% of the plasma passing through the glomerulus becomes part of the glomerular
filtrate.
b. Solutes dissolved in the plasma, such as glucose, amino acids, and various salts, become
part of the filtrate.
c. The normal glomerular filtration rate adds up to about 80 L every 24 hours.
d. Approximately 75% of the filtrate is reabsorbed into the blood through the renal tubules.
e. The filtration membrane prevents the passage of cells, but allows large molecules to pass
through.
B
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Natural sources of energy on the early Earth caused ____
a. spontaneous genetic mutations b. chemical bonds to break c. chemical bonds to form d. chemical bonds to break and form e. spontaneous genetic mutations and chemical bonds to break and form
How are new combinations of alleles introduced into chromosomes?
a. independent assortment in meiosis I b. crossing over in meiosis I c. breeding between the dominant individuals in the population d. breeding between the recessive individuals in the population e. independent assortment at meiosis II
An example(s) that illustrate(s) natural selection
acting on behavioral traits that benefit individuals include(s) a. the effect of oxytocin on vole reproductive behavior. b. the different responses of young coastal and inland garter snakes to banana slugs. c. courtship behavior in sage grouses. d. the nest-decorating behavior of starlings. e. all of these.
Because of the ____________________ effect, traits carried by early settlers are found in a large
fraction of the population. Fill in the blank(s) with the appropriate word(s).