How does meiosis generate genetic diversity?
A. crossing over
B. random alignment at metaphase 1
C. synapsis
D. Answers a and b are both correct.
D
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How can mutations in different genes, functioning in different cells, lead to the same disease? From the following, choose the best responses to complete the sentences: "Physiological function requires that multiple cells work together. Various defects in different cells can impair function, leading to ___________ that are indistinguishable at the level of the whole organism. In Charcot-Marie-Tooth disease, motor nerve function can be impaired either by a problem within _______________ , or a problem in __________________ causing _______________."
Charcot-Marie-Tooth is the most commonly inherited peripheral neuropathy, and has no known cure. Patients suffer damage to motor and sensory neurons, leading to degeneration of muscles and gradual loss of motor control. A. defects; somatic cells; oligodendrocytes; demyelination B. symptoms; motor neurons; Schwann cells; demyelination C. symptoms; sensory neurons; Schwann cells; fast axonal transport D. genotypes; dendrites; axons; fast axonal transport Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content/Choose Answer · What do you already know about components of the nervous system? What other information is related to the question? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Plants can close tiny gaps in their epidermis, referred to as ____, to limit water loss from internal tissues
a. periderm b. stomata c. endoderm d. tracheids e. sclereids
In older stems and roots, a complex dermal tissue called ____ replaces the epidermis
a. endoderm b. periderm c. mesophyll d. cortex e. lignin
The first part of the small intestine is the
a. duodenum. b. ileum. c. pylorus. d. cecum. e. jejunum.