How do the numbers of chromosomes differ for organisms?
A) Among all known living creatures, humans have the most chromosomes.
B) Animals have more chromosomes than plants.
C) Eukaryotes have more chromosomes than prokaryotes.
D) Prokaryotes have more chromosomes than fungi.
C
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Why do phospholipids form sheet-like cellular membranes, despite being partly hydrophilic?
a. The modified phosphate group forms covalent bonds with adjacent phospholipids in a sheet-like configuration. b. Cellular membranes form at the water’s surface, with hydrophobic fatty acids extended into the air above. c. The long fatty acid chains weave together like a tapestry, pulling the phosphate groups together in sheets. d. Only the phosphate group can interact with water; fatty acids are forced together in the middle of double sheets.
Cotransductant bacteria can occur if
A) a bacterial cell picks up two fragments of DNA from the environment, each with a different gene. B) double crossover occurs between prophage DNA and the bacterial chromosome. C) two genes are closely linked enough so that they can be packaged into a phage head and injected into a cell by a single phage. D) two genes are introduced into the same bacterium by simultaneous infection with two different phages. E) Both C and D
From which molecules are mRNA molecules transcribed?
a. tRNA b. rRNA c. DNA d. proteins
What is meant by the statement that water has a high specific heat?
A) It can absorb a lot of energy without changing temperature. B) Water freezes easily. C) It grows hot quickly. D) Water can heat up to only a certain temperature. E) The boiling point of water is low.