Which of the following is a correctly written scientific name?
A) Australopithecus afarensis
B) Homo sapiens
C) musca domesticus
D) Acer pensylvanicum
A
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The phylogeny above shows:
A. orangutans and gorillas are more closely related than humans and gorillas. B. humans and gorillas are more closely related than orangutans and gorillas. C. the gorilla is the most recent common ancestor to bonobos, chimps and humans. D. he orangutan is the most recent common ancestor of all great apes. E. all great apes walk with an upright gait.
Alcohol reduces ADH secretion which in turn
A. decreases tubule permeability to water and thus increases urine volume. B. decreases tubule permeability to water and thus decreases urine volume. C. increases tubule permeability to water and thus increases urine volume. D. increases tubule permeability to water and thus decreases urine volume. E. has no effect on the urine volume.
Before another action potential “spike” can occur
a. there must be a very brief restoration of the resting conditions in the membrane. b. the membrane voltage must drop to zero. c. the sodium-potassium pump must cease temporarily. d. all of the membrane gates must be closed at the same time. e. all of these must happen.
Both cis-acting sequences and trans-acting proteins affect gene expression in eukaryotic chromosomes
What are the three basic mechanisms by which trans-acting proteins access specific regulatory DNA sequences in eukaryotic chromosomes? Describe how chromatin is altered in each of these processes.