After a muscle cell contracts, which of the following must occur for the muscle to stop contracting?
A. Calcium ions must be pumped back into the endoplasmic reticulum.
B. Calcium ions must flow out of the endoplasmic reticulum.
C. Calcium ions must flow into the muscle cell.
D. Calcium ions must flow out of the muscle cell.
E. Calcium ions must be pumped out of the muscle cell.
A. Calcium ions must be pumped back into the endoplasmic reticulum.
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The scientific name for the ruffed grouse is Bonasa umbellus. Bonasa is
(a) the family name. (b) the genus. (c) the specific epithet. (d) all of the above.
The federal government, as well as several state governments, collects DNA samples from all individuals arrested – but not necessarily convicted – for serious crimes. Should this be allowed? Why or why not?
What will be an ideal response?
The central nervous system includes only ________
a. the brain and spinal cord b. afferent axons that carry sensory signals into the brain c. efferent axons that relay commands from the brain and spinal cord d. nerves that extend outside the brain and spinal cord
Generally, a pair of homologous chromosomes __________.
A) carry the same genes B) are the same length, shape C) interact at meiosis D) all of these choices