Which of the following conditions is identified by the release of histamine and serotonin?
a. ragweed hypersensitivity
b. HIV/AIDS
c. rheumatoid arthritis
d. dermatitis
a. ragweed hypersensitivity
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Although lacking a TCA cycle and a respiratory chain, ________ can divide with a generation time of eight to ten minutes when growing in a human host.
A. Staphylococcus aureus B. Streptococcus pyogenes C. Clostridium perfringens D. Helicobacter pylori
Which of the following is true of AIDS?
a. It is equivalent to HIV. b. It is highly contagious. c. There is no cure for those afflicted. d. It is caused by a bacterium. e. It can be prevented by vaccination
What are alleles?
A. the dominant form of a gene B. the locations of genes on a chromosome C. genes for different traits, such as hair color or eye color D. alternative forms of a gene for a single trait, such as blue eyes or brown eyes E. the recessive form of a gene
Select the valid statements about cell signalling from the list below. There may be more than one valid statement
A. Steroid hormones usually don't need receptors because they can pass freely through the cell membrane. B. IP3 can open Ca2+ channels in the membrane of endoplasmic reticulum C. A decrease in cAMP activates protein kinase A (PKA) D. GPCRs activate a class of trimeric GTP binding proteins