The concentration of calcium ions in the ER lumen, the plant cell vacuole and the extracellular space are on average more than _______ times higher than in the cytosol.
a) 1,000,000
b) 100
c) 10
d) 1000
e) 10000
Ans: e) 10000
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When the atoms involved in a covalent bond have the same electronegativity, what type of bond results?
A) an ionic bond B) a hydrogen bond C) a nonpolar covalent bond D) a polar covalent bond
Several species of Caribbean Anoline lizards have evolved from a single ancestral species. The species occupies a wide variety of ecological niches, such as tree trunks and the ground, or tree trunks only, or tree trunks and the crown of trees, etc. This type of allopatric speciation is called
A. adaptive radiation. B. hybridization. C. alloploidy. D. autoploidy.
Tubal ligation _____
A) reduces the incidence of ovulation B) prevents fertilization by preventing sperm from entering the uterus C) prevents sperm from exiting the male urethra D) prevents oocytes from entering the uterus
Membrane curvature is influenced by the differential lipid composition of the two membrane monolayers
Which factor do you think has the largest impact on the curvature of biological membranes? (a) amount of cholesterol (b) charge of the lipid head group (c) length of the hydrocarbon tails (d) size of the lipid head group 11-26 Glycolipids are found on the surface of healthy cells, and contribute to the cell's defense against chemical damage and infectious agents. A. In which organelle are sugar groups added to membrane lipids? B. By what mechanism are glycolipids transported to the plasma membrane and presented to the extracellular environment? Draw a diagram to support your answer to part B. Membrane Proteins