What happens when diffusion moves molecules across the plasma membrane?
A) The process is relatively slow and is driven by concentration gradients.
B) Most molecules are capable of crossing the phospholipid bilayer at any location and at basically the same rate.
C) The cell gains needed materials and gets rid of excess materials very quickly.
D) The rate of diffusion cannot be influenced by the cell.
E) Energy input is required to transport molecules.
A
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Agricultural lands frequently require nutrient augmentation because _____
A) nitrogen-fixing bacteria are not as plentiful in agricultural soils because of the use of pesticides B) the nutrients that become the biomass of plants are not cycled back to the soil on lands where they are harvested C) land that is available for agriculture tends to be nutrient-poor D) grains raised for feeding livestock must be fortified, and thus require additional nutrients E) cultivation of agricultural land inhibits the decomposition of organic matter
A protein is destined to be secreted from a cell. In which of the following organelles would you expect to find the protein first?
A) endosome B) Golgi apparatus C) lysosome D) secretory vesicle
What process is shown in this diagram?
a. oxidation
b. reduction
c. phosphorylation
d. dephosphorylation
Which of the below is a hallmark of cancer?
a. generate their own mitogenic signals b. resist exogenous growth-inhibitory signals c. evade apoptosis d. all the above are hallmarks of cancer