Which of the following substances that are carried in blood can not diffuse across endothelial cells of a capillary?
a. carbon dioxide
b. proteins
c. small lipid-soluble molecules
d. oxygen
b
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Carriers that shed and transmit pathogens a long time after they have recovered from an infectious disease are called ________ carriers.
A. asymptomatic B. convalescent C. passive D. chronic E. incubation
Which researchers showed that DNA is the genetic material?
A) Watson and Crick B) Hershey and Chase C) Garrod and Griffith D) Meselson and Stahl
_____ in arteries sense changes in the acidity of the blood
a. Mechanoreceptors c. Photoreceptors b. Neurotransmitters d. Chemoreceptors
Genes for protein receptors for LH, FSH, and TSH
a. are found in sea anemones. b. have similar nucleotide sequences in sea anemones and vertebrates. c. produce structurally similar gene products in sea anemones and vertebrates. d. presumably arose millions of years ago in a common ancestor of sea anemones and vertebrates. e. include all of these.