Which of the following descriptions illustrates phenotype variation caused by environment?
A) inheritance of body builder "physique"
B) diet of caterpillars changes their morphology
C) variation in horse coat color
D) average beak depth during drought
Answer : B) diet of caterpillars changes their morphology
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During a field trip, an instructor touched a moth resting on a tree trunk. The moth raised its forewings to reveal large eyespots on its hind wings. The instructor asked why the moth lifted its wings
One student answered that sensory receptors had fired and triggered a neuronal reflex culminating in the contraction of certain muscles. A second student responded that the behavior might frighten predators. Which statement best describes these explanations? A) The first explanation is correct, but the second is incorrect. B) The first explanation refers to proximate causation, whereas the second refers to ultimate causation. C) The first explanation is biological, whereas the second is philosophical. D) The first explanation is testable as a scientific hypothesis, whereas the second is not. E) Both explanations are reasonable and simply represent a difference of opinion.
Organisms that demonstrate a type I survivorship curve are characterized by:
a. death rate of the population does not vary with age b. low death rate until mid-life c. low death rate until late in life d. high death rate in early life e. high death rate in mid-life
Why is the Lineweaver–Burk plot important in enzyme kinetics?
A) It is a single-reciprocal plot. B) It illustrates enzyme specificity. C) It reveals the presence of prosthetic groups in enzymes. D) It makes it easier to determine Vmax and Km. E) It is nonlinear.
Cells are composed of chemicals and both the structure and function of cells are regulated by the basic principles of chemistry
Indicate whether the statement is true or false.