Which of these plant tissue types is composed of cells with primary walls thickened at the corners that provide support for immature parts of the cell body?
A. collenchyma
B. phloem
C. sclerenchyma
D. xylem
E. parenchyma
Answer: A
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Besides sending messages to and from the brain, the spinal cord has another important function: Reflexes. In fact, in very simple animals, that is the main function of the cord. In higher animals, reflexes are important because they provide
_____ protection from sudden or unexpected environmental harms. _____ stimulation of the brain as a protection against atrophy in situations where voluntary movement is hindered, such as a coma. _____ objective physical evidence of neurological injury. _____ maintenance of life-sustaining processes such as breathing and heart beat, even while sleeping or unconscious.
Introns in pre-mRNA:a
code for specific protein domains. b. are spliced out of the message. c. move within the mRNA, giving rise to new exon combinations. d. protect pre-mRNA from enzyme degradation
e. code for important amino acid sequencesEach of the following is true regarding cancer cell metastasis to secondary sites except
A) cancer cells may multiply in regional lymph nodes if they enter via lymphatics. B) many cells from the primary mass may enter circulation. C) all cancer cells circulating in the bloodstream are identical. D) few cancer cells survive in the bloodstream. E) the population of cancer cells is heterogeneous.
Different species of animals have very different nutritional requirements and gastrointestinal tract (GIT) specializations, depending on their primary diets
For example, carnivorous animals have relatively short small intestines, fast gut passage rates, and high protein requirements, in accordance with the high-protein, easily digested prey they consume. Based on your knowledge of nutrition and digestion and on the example provided in this scenario, what do you conclude about ruminants, which eat low-protein, difficult-to-digest plant leaves? A) Their GITs and nutritional requirements are similar to those of carnivores, and they must also eat some animal prey to obtain enough dietary protein. B) They have reduced protein requirements, long GITs, and slow gut passage rates to extract as many nutrients as possible from their diet. C) They have reduced protein requirements but GITs and gut passage rates similar to those of carnivores. D) They have normal nutritional requirements but extremely short GITs and fast gut passage rates to maximize the amount of food passing through the GIT.