In using the scientific method, which step must precede the formulation of a hypothesis?
a) experiment
b) conclusion
c) observation
d) data collection
Answer: c) observation
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A laboratory might use dideoxyribonucleotides to _____
A) separate DNA fragments B) clone the breakpoints of cut DNA C) produce cDNA from mRNA D) sequence a DNA fragment E) visualize DNA expression
In seed plants, the transfer of immature male gametophytes to female reproductive parts is a process called ____
a. meiosis b. pollination c. fertilization d. mitosis e. sporulation
Why would hydrophilic substances such as sodium ions (Na+), hydrogen ions (H+), sugars, and amino acids be unable to simply diffuse across a plasma membrane?
a. They readily mix with the hydrophobic tails forming the core of the phospholipid bilayer. b. They are repelled by the hydrophilic heads of the phospholipids that form the phospholipid bilayer. c. They do not readily mix with the hydrophobic tails forming the core of the phospholipid bilayer; therefore, they must move across by facilitated diffusion. d. They do not readily mix with the hydrophobic tails forming the core of the phospholipid bilayer; therefore, the only way they can move into the cell is by endocytosis.
The next time you need to mow the grass, you can excuse yourself, saying that by mowing you are helping to maintain a man-made
A) biome. B) ecosystem. C) population. D) climax community. E) subclimax community.