Recall that photosynthetic rates remain relatively constant in regions near the equator. Imagine that tropical environments persisted throughout Earth's northern and southern hemispheres (i.e., Earth's entire climate mirrored that near the equator)
If Keeling had
collected his atmospheric CO2 data on such an Earth, what would you expect the Keeling
Curve to look like?
A. a straight line sloping upward (atmospheric
CO2 levels do not seasonally oscillate, but
have increased over time)
B. a straight line sloping downward
(atmospheric CO2 levels do not seasonally
oscillate, but have decreased over time)
C. a sinusoidal curve sloping upward
(atmospheric CO2 levels fluctuate seasonally,
but increase over time)
D. a sinusoidal curve sloping downward
(atmospheric CO2 levels fluctuate seasonally,
but have decreased over time)
E. a straight line without a slope (atmospheric
CO2 levels have remained constant over
time)
A
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Which statement is NOT true?
a. Membranes are often perforated by proteins that extend through both sides of the membrane. b. Some membranes have proteins with channels that allow for the passage of hydrophilic substances. c. Hydrophilic substances have an easier time passing through the lipid bilayer than do hydrophobic substances. d. The current concept of a membrane is best summarized by the fluid mosaic model. e. All of these statements are NOT true
Which of the following techniques is most commonly used to separate DNA molecules by size?
A) PCR B) RFLP C) Chromatography D) DNA sequencing E) Gel electrophoresis
The first law of thermodynamics states that:
A) in energy-yielding reactions, matter goes from a more-ordered to a less-ordered state. B) all living organisms must eat to derive energy. C) energy can be neither created nor destroyed. D) energy is required to bring molecules into a cell against a concentration gradient.
Which of the following is considered “specific” immunity?