Which of the following is most like an
endoskeleton?
a. the wooden frame of a house
b. the covering of chair
c. the hair of a dog
d. the trunk of a tree
e. an umbrella handle
A
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Eggs can contain bacteria such as Salmonella. explain why cooking eggs make them safe to eat.
What will be an ideal response?
Methane is an important greenhouse gas whose levels in the atmosphere are also rising. This is because:
A. methane is generated by archaeons living in the guts of cattle, and beef production is increasing. B. methane is generated by archaeons living in waterlogged rice paddies, and rice production is increasing. C. methane is released when permafrost at high latitudes melts, and more permafrost is melting. D. methane is generated by archaeons living in the guts of cattle and in rice paddies, and both beef and rice production are increasing. E. All of the above.
Which strand is the coding strand, and where is the N-terminal end of the resulting peptide located?
A) The top strand is the coding strand, and the N-terminus is on the right. B) The top strand is the coding strand, and the N-terminus is on the left. C) The bottom strand is the coding strand, and the N-terminus is on the right. D) The bottom strand is the coding strand, and the N-terminus is on the left. E) Not enough information is given.
Which of the following is true of supercoiling?
A. The relaxed form of DNA is more stable and is therefore the preferred form in the cell. B. Most organisms maintain their DNA in a slightly overwound state in order to enhance strand separation during transcription and replication. C. Overwound DNA is in the B form so relaxed DNA has less turns than B-form DNA. D. Most organisms maintain their DNA in a slightly underwound state in order to compact their DNA. E. The relaxed form of DNA can only be maintained if the DNA is a closed circle.