Which of the following contribute to the surface area available for water absorption from the soil by a plant root system?
I) root hairs
II) endodermis
III) mycorrhizae
IV) fibrous arrangement of the roots
A) II and III
B) I, III, and IV
C) I, II, and IV
D) I, II, III, and IV
B
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Answer the following statements true (T) or false (F)
1. Capillary electrophoresis is a technique used to separate DNA pieces. 2. Familial DNA search was used in the case of California's "Grim Sleeper." 3. In a familial DNA search, DNA from a crime scene is compared to DNA in databases from convicted felons, and if nearly half the CODIS sites match, a first-degree relative of the convict becomes a suspect. 4. DNA on a glove left at the crime scene is an example of primary DNA transfer. 5. Familial DNA searches are controversial since innocent people may be accused based on sharing CODIS markers with convicted felons.
Which of the following statements concerning glial cells is true?
a. Astrocytes are phagocytic cells that remove debris in the central nervous system. b. Schwann cells form sheaths around neurons within the central nervous system. c. Oligodendrocytes regulate the concentration of neurotransmitters in neurons. d. Microglia are involved in the neurological disease multiple sclerosis. e. Ependymal cells help produce and circulate cerebrospinal fluid.
Which of the following statements about El Niño are true?
A. Occurrence of El Niño is irregular and unpredictable. B. El Niño events in the Pacific can influence weather as far away as Africa. C. The immediate effect of El Niño is a weakening in the east-to-west trade winds D. Weakening in the trade winds results in more upwelling along the Peru-Ecuador coast. E. El Niño results in the movement of weather systems from the western Pacific eastward.
HIV spikes attach to CD4+ receptors found on
A) T helper cells. B) macrophages. C) dendritic cells. D) T helper cells and macrophages. E) T helper cells, macrophages, and dendritic cells.