Which of the following is not an effect of epinephrine throughout the body?
A. Promotes the breakdown of glycogen in skeletal muscle cells
B. Relaxes lung airways
C. Stimulates heart muscle cells
D. A person feeling energized after drinking a cup of caffeinated coffee
E. The body's ability to digest a large meal
E. The body's ability to digest a large meal
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The effects of allometric growth on head morphology in the human and chimpanzee
A. The human and chimp fetal skull are exactly the same, the human jaw development slows down after adulthood.
B. Heterochrony is occurring, the chimp jaws continue to develop at a faster rate than human jaws.
C. Paedomorphosis is occurring, the human jaw retains its small size while the chimp jaw continues to grow even in adulthood.
D. The nasal passages of the chimp are shortened due to reduced growth during fetal development while the nasal passages of the human grow through adulthood.
E. All of the choices are correct.
The ribosome binding site in an mRNA transcript is located ____ and is where ____
a. at the start codon; the large ribosomal subunit binds to the mRNA-tRNA complex in prokaryotes b. just upstream of the start codon; the large ribosomal subunit binds to mRNA in eukaryotes c. at the start codon; the small ribosomal subunit binds to the mRNA-tRNA complex in eukaryotes d. on aminoacyl-tRNA; the large ribosomal subunit binds to tRNA in prokaryotes e. just upstream of the start codon; the small ribosomal subunit binds to mRNA in prokaryotes
Menstruation
A) is triggered by an LH surge. B) is triggered by HCG. C) is triggered by an increase in the levels of estrogen and progesterone. D) coincides with the beginning of the pre-ovulatory phase of the ovarian cycle.
How does comparative data on genes of extant species help us to make estimates of what happened before the phylogenetic event horizon?
a. Common genes must have existed for a long time. b. If the first life-forms consisted of RNA, then current RNA-coding genes must be the ancestral genes. c. Common functional genes imply the minimal characteristics of early cells. d. Because so many small genome bacteria are endosymbionts, the earliest cells must have been endosymbionts.