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
Ans:
B. IP3 can open Ca2+ channels in the membrane of endoplasmic reticulum
D. GPCRs activate a class of trimeric GTP binding proteins
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An autosome is a ____
a. chromosome other than a sex chromosome b. structure used to transport genetic material to the cytoplasm c. chromosome containing a group of genes involved in autoimmune disorders d. region of the DNA that is self-replicating e. cellular body involved in autoimmune disorders
Vinblastine, a chemotherapeutic drug used to treat breast and testicular cancers, interferes with the assembly of
microtubules. Speculate how this drug works to inhibit cancer cell growth.
a. Vinblastine inhibits transition from G1 to S. b. Vinblastine inhibits transition from S to G2. c. Vinblastine inhibits cytokinesis. d. Vinblastine disrupts mitotic spindle formation and consequently mitosis. e. Vinblastine inhibits cyclin production.
Species of Rhizobium and Bradyrhizobium bacteria are most directly associated with ____
a. nitrification b. ammonification c. nitrogen cycling d. nitrogen fixation e. nitrogen assimilation
What advantages does a complete digestive tract have over a blind-ended gastrovascular cavity?
What will be an ideal response?