In human males, the different types of male sex hormones are collectively called
A. estrogens.
B. growth hormones.
C. progesterones.
D. androgens.
E. follicle-stimulating hormones.
D. androgens.
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The following events occur during the initiation of a skeletal muscle contraction. Put the following events in order of occurrence starting with the first event
a. signal travels along motor neuron b. calcium is released c. action potential moves down T tubules d. action potential arrives at neuromuscular junction e. action potential travels along muscle fiber membrane f. acetylcholine is released g. myosin binds actin h. binding of acetylcholine triggers an action potential in a muscle fiber i. action potential arrives at sarcoplasmic reticulum
Hybrid inviability occurs when two species mate and produce fertile offspring
Indicate whether the statement is true or false
What is the term for organisms in which internally-fertilized eggs are laid to develop and hatch outside the mother's body?
A. placental B. ovoviviparous C. oviparous D. viviparous E. marsupial
Mitochondrial DNA profiling is used to trace the maternal side of family trees. Why is this done using mtDNA?
A) The mtDNA under low selective pressure mutates readily. B) The mtDNA undergoes recombination allowing allelic mixture. C) The mtDNA is supplied to the zygote only from the egg. D) The mtDNA only comes from the father so all differences are from the mother.