The most primitive vertebrates are members of the group of:
a. jawless fishes
b. amphibians
c. cartilaginous fish
d. birds
e. bony fish
a
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Peter and Rosemary Grant study natural selection in finches on the Galápagos Islands. They have hypothesized that dry condition produce larger seeds and may result in larger beaks in succeeding generations of finches. The figure below shows their data from 1976 and 1987. The y-axis is the number of birds measured and the x-axis is the beak depth. Does their data support their hypothesis and why?
A. yes; because there were more birds measured in 1978 after the drought, therefore they must have been able to get food and reproduce.
B. yes; because the average beak depth of birds in the population increased from 8.8mm in 1976 to 9.8mm in 1978.
C. no; because even though more birds were measured in 1978, the beak size of the upper range was smaller.
D. no; because in 1976, before the drought, the largest beak depth was still 11.3mm.
E. no; more data would be necessary to show a support of their hypothesis.
Which factor may contribute to the development of osteoporosis?
a. calcium absorption b. over-production of sex hormones c. smoking d. an active life style e. puberty
Be has an atomic number of 4 and an atomic mass of 9. How many protons does it have?
A. 7 B. 5 C. 9 D. 4 E. 13
Codons are _____ of mRNA that specify different _____.
A) nuclei, DNA B) proteins, genes C) base triplets, amino acids D) polypeptides, proteins