In mollusks, the folds of tissue that arise from the dorsal body wall and enclose a cavity surrounding the visceral mass are called the
A. foot.
B. mantle.
C. nephridia.
D. radula.
E. lophophore.
B. mantle.
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Being heterozygous for the hemoglobin gene variant that causes the disease sickle-cell anemia can be advantageous in what situation?
A. in areas where malaria is endemic B. when iron intake is too low in the diet C. in elite athletes because it slightly decreases oxygen affinity D. when a person has anemia caused by other factors E. when a person is at high altitude
The female hormones that participate in milk
production for and delivery to the newborn are a. prolactin and oxytocin. b. prolactin and estrogen. c. prolactin and progesterone. d. oxytocin and estrogen. e. oxytocin and progesterone
The essence of meiosis is that
a. gametes receive one copy of each member of each pair of homologous chromosomes. b. diploid gametes are formed. c. each gamete receives one member of each pair of homologous chromosomes. d. haploid gametes are formed. e. each gamete receives one member of each pair of homologous chromosomes, and haploid gametes are formed.
Many clinical microbiology laboratories and public health laboratories use techniques such as microbial staining, microbial growth, enzymatic testing, fermentation testing, and microscopic analysis to identify pathogens in samples. Which categories of classical characteristics for taxonomy are represented here? (Check all that apply.)
A. Biochemical characteristics B. Molecular characteristics C. Physiological and metabolic characteristics D. Morphological characteristics