Chromosomes become visible during prophase of
mitosis as a result of
a. uncoiling.
b. DNA synthesis.
c. condensation.
d. chromatid duplication.
e. addition of proteins to the DNA
Answer: c
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Cyanobacterial photosynthesis is similar to plant photosynthesis in the ____
a. type of chlorophyll used b. splitting of water c. production of oxygen d. type of chlorophyll used and splitting of water e. type of chlorophyll used, splitting of water, and in the production of oxygen
A scientist fused a mouse cell and a human cell, then treated the cell with specific antibodies
covalently linked to fluorescent dyes (antibodies to mouse proteins--green; antibodies to human proteins--red). Forty minutes later, the researcher looked at the fused cell and observed ____.
a. the cell was still half red and half green. b. the red and green fluorescent labels were uniformly distributed across the entire membrane c. the red and green labels were distributed in intermingled patches d. the red and green labels flashed intermittently e. the red and green labels were distributed in a swirling pattern
While synthesizing a new blue pigment, a chemist notices that the new compound accumulates between an aqueous (water) environment and a hydrophobic environment
When added to a mixture of oil and water, the pigment creates a blue ring around the droplets of oil. Which of the following statements best describes this new pigment? A) The pigment is a polar molecule and is forming hydrogen bonds with both the water and oil molecules. B) The pigment is hydrophilic and will not form hydrophobic bonds with the oil. C) The pigment is amphipathic, having polar and nonpolar regions. D) The pigment is neither polar nor nonpolar; it is apolar. E) The pigment is probably hydrophobic and is attempting to bond with the oil.
The brain stem consists of the midbrain, the pons and the _________ oblongata.
Fill in the blank(s) with the appropriate word(s)