The Earth is actually farther from the sun during the period when the Northern Hemisphere is having summer. How can this be explained?
A. There must be some mistake in measuring the Earth's orbit because if the Earth were farther away, we would be cooler.
B. There is a six-month lag phase between sunlight being absorbed and lost.
C. The tilt of the Earth presents the Northern Hemisphere in a more perpendicular angle, and this increased sunlight more than offsets the decrease in sunlight due to the added distance.
D. The sun grows more powerful on a half-year cycle.
Answer: C
You might also like to view...
Which of the following is the major reason why it has been difficult to treat viral infections with chemotherapeutic agents?
A. Viruses use the metabolic machinery of their hosts, which limits many of the potential points of attack. B. Viruses have no metabolism and therefore offer no selective point of attack. C. Viral metabolism resembles that of their hosts so there is no selective point of attack. D. Actually, viruses are not difficult to treat with chemotherapeutic agents.
How do negative regulators such as the Lac repressor prevent RNA polymerase from initiating transcription?
A) by blocking the ribosome binding site B) by forming a loop in the operator that restricts the passage of the polymerase C) by physically blocking the DNA binding site of RNA polymerase D) by binding to the polymerase to inhibit its catalytic activity
If an error is made during replication that is not caught by DNA polymerase, the most likely is that _____
a. both strands of DNA will be mutated b. only the daughter strand will be mutated c. a mutation that causes cancer will occur d. DNA ligase will repair the mistake before a mutation occurs e. DNA replication will stall indefinitely
In eukaryotes, transcription takes place in the ________ and translation takes place in the ________.
A. nucleoid, cytoplasm B. nucleus, nucleus C. cytoplasm, nucleus D. nucleus, cytoplasm E. cytoplasm, cytoplasm