In summer, when plant roots are converting sugar to store as starch, the root is the sugar ________ and the leaves are the sugar ________
A) source; source
B) sink; sink
C) source; sink
D) sink; source or sink
E) sink; source
E
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Match the following items with the correct phrases.
_______1. A superinfection with this organism can lead to antibiotic-associated diarrhea and pseudomembranous colitis. _______2. The only drugs that can be used to treat infections caused by these Gram-positive cocci in clusters are vancomycin, Synercid and Zyvox; unfortunately, some strains have even developed resistance to these antibiotics. _______3. “Superbugs” known as VRE are vancomycin-resistant strains of __________. a. Enterococcus spp. b. MRSA c. Clostridium difficile d. Escherichia coli e. Enterobacter spp.
Answer the following statements true (T) or false (F)
1. An assumption for the use of molecular clocks is that neutral mutations accumulate at a rapidly increasing rate over time between two species. 2. A modern goal of systematics is to classify organisms based on similarity of form and function, regardless of their evolutionary relationships. 3. A phylogenetic tree shows the hypothesized evolutionary relationships among organisms, meaning that its structure can be revised and changed as new information about those relationships becomes known. 4. The alternate host for Entamoeba histolytica is the Anopheles mosquito.
The most important events in human development occur during the ____
a. week before birth b. month before birth c. first trimester d. second trimester e. third trimester
Proton pumps are used in various ways by members of every domain of organisms: Bacteria, Archaea, and Eukarya. What does this most probably mean?
A) Proton gradients across a membrane were used by cells that were the common ancestor of all three domains of life. B) The high concentration of protons in the ancient atmosphere must have necessitated a pump mechanism. C) Cells of each domain evolved proton pumps independently when oceans became more acidic. D) Proton pumps are necessary to all cell membranes.