Which of the following is/are required with actin and myosin in order to initiate muscle contraction?
A. ATP
B. calcium and phosphate
C. phosphate
D. calcium and ATP
E. calcium
D. calcium and ATP
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While walking along the beach at Point Lobos, California, the fellow pictured walks up to you with algae in hand. Figuring you to be a college student who has probably had a good introductory biology course, he asks if you know what it is.
(a) What is the cell wall component of the organism that has commercial value? (b) Name three uses for that cell wall component.
One source of trait variations among individuals is the process of fertilization, in which when new combinations of maternal and paternal alleles are produced. What other sources contribute to trait variations within a species?
What will be an ideal response?
Both low birth and death rates characterize the demographic transition. Which factors will lower birth and death rates for twenty-first century Homo sapiens?
What will be an ideal response?
Which structures are paired blocks of mesoderm found in the embryonic disc?
a. primitive streak b. neural tube c. notochord d. pharyngeal arches
e. somites