Answer the following statements true (T) or false (F)
1.Weak muscular contraction could be due to either poor binding of actin and myosin or to insufficient calcium available to stimulate contraction.
2.Bones can provide calcium to the rest of the body if it is needed.
3.Bones have blood vessels attached to their surfaces but not penetrating them.
4.The long bones of the human body begin as cartilaginous structures in embryos.
5.The long bones of the human body elongate during development via growth plates at their ends.
1.TRUE
2.TRUE
3.FALSE
4.TRUE
5.TRUE
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In figure (a), what was the dependent variable?
A. the generation
B. the species of fish
C. the age of the fish
D. the size at which the fish were harvested
E. the mean weight of harvested fish
The essence of meiosis is that
a. one gamete receives the maternal chromosomes, and the other gamete receives the paternal chromosomes. b. diploid gametes are formed. c. gametes are formed after one cell division. d. diploid spores are formed. e. haploid gametes are formed.
Four of the five statements below are consistent with
Darwin’s theory of natural selection. Select the exception. a. All populations tend to overproduce. b. Some members are more adapted to the rigors of competition. c. Limited resources put limits on population growth. d. Variation in individuals is not inheritable. e. Traits appear and disappear.
A number of plants in a wilderness area carry a mutation that makes their soft, colorful fruits bitter and unpalatable. Would you expect this mutation to increase or decrease in frequency in the plant's population?
A. It depends whether the plants use sexual or asexual reproduction. B. The mutation will decrease in frequency. C. It depends whether they are pollinated by the wind, birds, or insects. D. The mutation will increase in frequency.