________ the spread of cancer cells from their site of origin to other sites in the body.
Fill in the blank(s) with the appropriate word(s).
Metastasisis
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What is the purpose of sex pili?
a. To transmit DNA between bacteria b. To transmit RNA between bacteria c. To transmit enzymes between bacteria d. To transmit chemical signals between bacteria e. To transmit zygotes or sperm between bacteria
Which statement about cholesterol is TRUE?
a. If the blood contains too much HDL, cholesterol may be deposited on the arterial wall. b. LDLs transport cholesterol from cells to the liver when cholesterol levels are high. c. LDLs must bind with an LDL receptor on the cell membrane to be taken up by cells. d. Most plasma cholesterol is transported on HDLs or high-density lipoproteins.
e. Omega-3 fatty acids are thought to decrease HDL levelsThe association of nitrogen fixing bacteria of the genus Rhizobium with legumes such as peas is an example of
mutualism. Indicate whether the statement is true or false.
Imagine that 1 milliliter of an experimental drug diluted in a saline solution is injected into 20 pregnant mice to determine possible side effects. Which of the following is a suitable control for this experiment?
A) 20 pregnant mice injected with 1 milliliter of saline B) 20 male mice injected with 1 milliliter of saline C) 20 non-pregnant mice injected with 1 milliliter of the drug D) 20 male mice injected with 1 milliliter of the drug E) 20 pregnant mice injected with 2 milliliters of the drug