Bacteria collected from a severely inflamed wound are sent to the lab for analysis. The results come back as follows: Gram-positive cocci in irregular clusters, kinase and coagulase positive, and able to grow in the presence of most antibiotics except vancomycin. The bacteria in the wound are most likely
A) Enterococcus.
B) Staphylococcus epidermidis.
C) Staphylococcus aureus.
D) methicillin-resistant Staphylococcus aureus (MRSA).
E) Streptococcus pyogenes (group A streptococcus).
D
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The figure shows a simplified phylogeny of closely related species of primates. This tree was proposed by comparing DNA sequence changes in the gene for cytochrome oxidase subunit II. The vertical scale represents time and the branch points represent common ancestors. What species did ancestor B give rise to?
A. Siamangs and orangutans.
B. All of the species except orangutans.
C. All of the species except siamangs.
D. All of the species except siamangs and pigmy chimps.
Hans Spemann and Hilde Mangold conducted pioneering experiments in which they transplanted the dorsal lip of the blastopore in an early gastrula newt to the ventral side of another early gastrula newt. What was the outcome of this experiment?
A. Discovery of Spemann's organizer. B. The development of dorsal structures (neural tube, notochord) on both the dorsal and ventral parts of the gastrula that received the transplant. C. Identification of a morphogenic field in the dorsal lip of the blastopore of an early gastrula. D. Discovery of a group of embryonic cells in the dorsal lip that ultimately produce specific body structures. E. All of the choices are correct.
List at least five of the assumptions that pertain to a population in a Hardy-Weinberg equilibrium
What will be an ideal response?
________-driven promoters are comprised of an Inr sequence and a TATA box with or without an associated BRE
Fill in the blank with correct word.