To support the existence of life on Mars (or any other planet), why is it important to demonstrate the availability of liquid water?
What will be an ideal response?
The chemical reactions of metabolism require liquid water.
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What type of molecule is used in a protein microarray to measure protein expression?
A. cDNA B. mRNA C. Single-stranded DNA D. Antibodies
Which of the following violate(s) the second law of
thermodynamics? a. gasoline engines b. life c. nuclear power plants d. stars such as the sun e. none of these
Older roots can become extremely thick and woody as ________ accumulates during secondary growth.
A. Secondary phloem B. Sapwood C. Primary xylem D. Secondary xylem E. Primary phloem
An insectivorous bird has the choice of eating (1 ) meadow beetles, which are abundant and large but expose the bird to hawk predation, (2 ) under-a-rock beetles, which are large and fatty but hard to obtain, or (3 ) under-a-leaf beetles, which are easy
to obtain but small. The bird has nestlings to feed. As an optimal forager, it will A) concentrate on under-a-leaf beetles because they are easy and safe. B) concentrate on under-a-rock beetles because they are energy-rich. C) eat one kind of beetle at a time (first under-a-leaf, then meadow, then under-a-rock), switching to a new kind when the old kind becomes scarce. D) eat all three kinds of beetles, balancing the energy spent and the risks incurred against the energy gained.