How are viruses such as HIV similar to living things? How are they different?
What will be an ideal response?
The best answers classify viruses according to the major characteristics of life discussed in Chapter 1. Viruses are organized entities made up of the same molecules that make up living things. Viruses contain DNA or RNA that can evolve. Parts of a virus exhibit motility. However, viruses do not carry on metabolism on their own, are unresponsive to environmental stimuli, and lack the ability to reproduce, grow, and develop without the help of a living cell.
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New mothers may benefit from the aid of lactation consultants when learning to breastfeed. These consultants give advice on technique, and help the mother to feel relaxed and confident. What hormone is associated with calm, warm emotions and is also critical for the milk let-down reflex?
A. prolactin B. estradiol C. oxytocin D. mammotropin
A female child inherits one X chromosome from her mother and one from her father. What sex chromosome does a male child inherit from each of his parents?
What will be an ideal response?
The center for control of motor skills and
posture is the a. cerebrum. b. pons. c. cerebellum. d. thalamus. e. hypothalamus.
The respiratory centers that control ventilation of the lungs in mammals are located in the
A. brainstem. B. bronchi. C. hypothalamus. D. neck. E. cerebral cortex.