The female hormone that participates in milk production is _____ and the hormone that facilitates delivery is _____
a. prolactin; oxytocin
b. prolactin; estrogen
c. prolactin; progesterone
d. oxytocin; estrogen
e. oxytocin; progesterone
ANSWER: a
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Which of the statements best describes the mutational event pictured below?
Wild-type ACC CAC UCU GGA UUU AAG GCA thr his ser gly leu lys ala Mutant ACC CAC UCU UGA UUU AAG GCA thr his ser stop phe lys ala A. a transversion mutation leading to a nonsense codon B. a frameshift mutation leading to a missense amino acid substitution C. a transition mutation resulting in a silent amino acid substitution D. a transition mutation leading to a nonsense codon E. an insertion mutation resulting in a frameshift of the amino acid sequence
Traditional and molecular phylogenies disagree on which one of the following issues?
A. whether or not the Eumetazoa are monophyletic. B. whether the Bilateria and Radiata split early into separate monophyletic clades. C. whether the split between Parazoa and Eumetazoa occurred at a very early stage in animal evolution. D. whether Echinodermata and Chordata are both deuterostomes. E. whether the appearance and type of coelom is important in interpreting phylogeny.
Describe the molecular activity that leads to muscle contractions, beginning at the neuromuscular junction
What will be an ideal response?
Mendel was quite ahead of his time in genetics, and many of his hypotheses have stood up to newer discoveries. However, we now know that independent assortment has many exceptions. Which of the following is an exception to the law of independent assortment?
a. monohybrid cross b. test cross c. gene linkage d. random mutation