One change that occurs within a sarcomere during muscle contraction is that the
A) thin filaments get thicker.
B) thick filaments move closer together.
C) Z lines move closer together.
D) thick filaments get thicker.
Answer: C
You might also like to view...
CD4+ T cells are activated by
A) interaction between CD4+ and MHC II. B) interaction between TCRs and MHC II. C) cytokines released by dendritic cells. D) cytokines released by B cells. E) complement.
In rabbits, spotted coat (S) is dominant to solid color (s) and black (B) is dominant to brown (b). A true-breeding black spotted rabbit is mated to a true-breeding brown solid rabbit to produce a heterozygous F1 generation. Two F1 individuals are mated, and you do not see a 9:3:3:1 (black spotted: black solid: brown spotted: brown solid) ratio of offspring, but instead see that almost all offspring are a non-recombinant phenotype. This tells you that
A. that the genes for fur pattern (spotted vs. nonspotted) and fur color are on the same chromosome. B. that the genes for fur pattern (spotted vs. nonspotted) and fur color assort independently. C. that fur pattern (spotted vs. nonspotted) and fur color are maternally inherited. D. that the genes for fur pattern (spotted vs. nonspotted) and fur color are on the X-chromosome and Y-chromosome, respectively. E. that the genes for fur pattern (spotted vs. nonspotted) and fur color are on different chromosomes.
The energy expenditure of a mammal at rest, in the postabsorptive state, and at a standard temperature is referred to as its
A. basal metabolic rate. B. standardized metabolic rate. C. baseline metabolic rate. D. activated metabolic rate. E. total metabolic rate.
What is a population viability analysis (PVA), and what predictions does it allow population biologists
to make?
What will be an ideal response?