What is occurring when a transport protein uses energy to pump a solute against its gradient across a cell membrane?
a. osmosis
b. passive diffusion
c. facilitated diffusion
d. turgor
e. active transport
e
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Helper T cells secrete
A) cytokines. B) antibodies. C) antigens. D) immunoglobulins.
Although birds, fish, mammals, reptiles and amphibians are different, evidence of their evolutionary
links is provided by a. chemical analysis. b. comparison of adult body forms. c. comparison of ways in which their embryos develop. d. time of gestation. e. comparing life expectancies.
Transmission genetics ____
a. studies the pattern of inheritance as traits are passed from generation to generation b. reconstructs the pattern of inheritance associated with a trait as it passes through several generations c. maps genes to study chromosome structure and abnormalities in chromosome numbers and organization d. uses recombinant DNA technology to identify, isolate, and produce millions of copies of genes that can be studied in the laboratory e. sequences the complete human genome
Which of the following scenarios represents a situation where a suspected disease-causing microbe would not be consistent with one or more of Koch’s postulates?
A. The microbe is found in all patients with a particular disease. B. Some healthy individuals possess the microbe. C. The microbe can be isolated and grown in pure culture D. Injection of the microbe into an animal host does not produce disease symptoms.