Sessile organisms overcome problems relating to sexual reproduction by
A. reproducing asexually.
B. releasing sperm into the water that surrounds them.
C. having internal fertilization.
D. producing larvae.
B. releasing sperm into the water that surrounds them.
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Match the following items with the correct phrases.
_______1. Capable of producing antibody-secreting plasma cells after clone formation. _______2. They help regulate the immune response by turning off certain activities. _______3. Phagocytic cells that act as “antigen-presenting cells” in the immune response to (processing of) T-dependent antigens. _______4. The major target of human immunodeficiency virus (HIV). _______5. The only cells required in the immune response to T-independent antigens. a. B lymphocytes (B cells) b. macrophages c. mast cells d. TH lymphocytes (THcells) e. TSlymphocytes (TScells)
Matching II. Choose the most appropriate answer
1. ___ autonomic nervous system 2. ___ frontal lobe 3. ___ cerebellum 4. ___ corpus callosum 5. ___ ganglion 6. ___ hypothalamus 7. ___ limbic system 8. ___ medulla oblongata 9. ___ midbrain 10. ___ nerve net 11. ___ peripheral nervous system 12. ___ reticular formation 13. ___ meninges 14. ___ neurotransmitter molecule 15. ___ white matter A. integrates body position, motions, balance B. in cnidarians; based on reflex pathways devoted to swimming and feeding C. messages from here arouse the brain and maintain wakefulness D. the cortical region that coordinates muscles required for speech E. all parts of nerve cells outside the brain and spinal cord F. acetylcholine is an example G. reflex control center for breathing, heart rate, and blood pressure H. axons of the central nervous system that are sheathed with fatty myelin I. at top of the brainstem bordering the cerebral hemispheres; influences learning and emotional behavior J. motor neurons that are divided into sympathetic and parasympathetic divisions K. membrane coverings over brain spinal cord L. contains the tectum; receives and integrates sensory information that is largely sent on to the forebrain for further neural processing M. connects right and left cerebral hemispheres N. group of nerve cell bodies that form an integrative center O. contains centers concerned with body temperature regulation and with salt and water balance
The accompanying figure shows a pedigree and the results of a Southern blot analysis of the ?-globin gene for four family members (II-1, II-2, II-4, and II-5). III-2 was just born and neither her health nor her DNA has been analyzed
The figure also shows a restriction map of ?A and ?S alleles and the location of three DNA probes (A, B, and C). If III-2 is analyzed by Southern blot using the same probe(s) as that used on other members of the family, what is the probability that the result will be only one band? A) 0 B) 1/9 C) 1/6 D) 1/4 E) 2/3
You have identified an enzyme that appears to be involved in the addition of palmityl group (a fatty acid) to certain proteins. Knowing that palmitoylated proteins are usually targeted for delivery to the plasma membrane, in which organelles might this enzyme be expressed?
A. Endoplasmic reticulum and ribosomes B. Golgi apparatus and endoplasmic reticulum C. Endoplasmic reticulum and nucleus D. Golgi apparatus and nucleus