In muscle contraction, ATP is used to:
a. deliver oxygen during oxygen debt.
b. pump calcium ions into the sarcoplasmic reticulum.
c. cause depolarization of the muscle membrane.
d. cause myosin filaments to shorten.
e. release acetylcholine into the synaptic cleft.
B
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Fossils older than ____ cannot be dated by their 14C content because ____
a. 60,000 years; most of the 14C has decayed by this time b. 12,000 years; half of the 14C has decayed by this time c. 6,000 years; older fossils do not contain carbon d. 2,000 years; most of the 14C has decayed by this time e. 500 years; half of the 14C has decayed by this time
Telomere maintenance in cancer cells is the result of
A) natural cell aging. B) active telomerase activity. C) the exchange of DNA between chromosomes. D) viral infection. E) Both B and C result in telomere maintenance.
Which of the following is a primary difference between ectomycorrhizae and endomycorrhizae?
A) Endomycorrhizae have thicker, shorter hyphae than ectomycorrhizae. B) Ectomycorrhizae do not penetrate root cells, whereas endomycorrhizae grow into invaginations of the root cell membranes. C) Endomycorrhizae are more common than ectomycorrhizae. D) There are no significant differences between ectomycorrhizae and endomycorrhizae.
List the functions of the urinary system.
What will be an ideal response?