Which of the following mutualists cannot survive without the mutualistic interaction?
A) facultative
B) subordinate
C) dependent
D) obligate
D
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Which event occurs in the lungs?
a. Free H+ binds to hemoglobin. b. Plasma HCO3? enters erythrocytes.
c. CO2 and H2O are converted into HCO3? and H+ in the plasma. d. Carbonic anhydrase converts CO2 and H2O into HCO3? and H+ in erythrocytes. e. CO2 binds to hemoglobin.
Gene order can be inferred from gene expression patterns because
A) an upstream gene can affect downstream gene expression. B) mRNAs for proteins in a pathway are produced at the same time, but then are translated only when the proteins are needed. C) proteins in a pathway are produced at the same time but the proteins that are not needed are degraded. D) mRNAs for proteins in a pathway are produced at the same time and those that are not needed are destabilized by miRNAs. E) gene expression does not depend on upstream genes.
Which cell does NOT have a nucleus in humans?
a. erythrocytes b. lymphocytes c. neutrophils d. eosinophils e. macrophages
Which of the following must be true for a woman who is heterozygous for a given gene?
a. She must be heterozygous for all genes. b. All of her eggs will contain both of the alleles for that gene. c. All of her eggs will contain one allele or the other, but not both alleles. d. She carries a rare mutation.