If the decolorizer is not left on long enough in the Gram-staining procedure, Gram-positive organisms will be stained ________ and Gram-negative organisms will be stained ________.
A. purple; purple
B. purple; colorless
C. pink; pink
D. purple; pink
Answer: A
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Answer the following statements true (T) or false (F)
1. Insulin's affect on reducing blood glucose levels are counteracted by glucagon's actions, which increase blood glucose. 2. Often one is not acclimated to the cold after having moved from a warm to cooler climate. Similarly, individuals may have difficulty adjusting to the heat after having moved from a cold to warm region. This difficulty in acclimating to different temperatures most likely requires adjustments in thyroid gland activity. 3. Glucocorticoids (i.e., cortisol, prednisolone, dexamethasone) have a diverse number of functions. They include glucose mobilization during stress, development of lung tissue, and therapies to reduce inflammation. 4. Metamorphosis in flatfishes and in amphibians is controlled by growth hormone. 5. It is rare that the nervous system integrates with the endocrine system to control hormone secretion.
When pollen from one species lands on the stigma of a flower from another species
a. the pollen tube typically does not develop. b. the pollen tube typically forms, but the sperm cannot penetrate the egg. c. the pollen tube typically forms and grows to the ovary, but then stops. d. the pollen tube typically forms, but the sperm are killed. e. the pollen tube typically forms and the egg is usually fertilized, but the embryo rarely grows.
From the data shown what can you conclude about the amount of time these plant cells spend in various stages of the cell cycle?
A) Cells spend more time in cytokinesis than in synthesizing new DNA during chromosomal duplication. B) Metaphase is the longest stage of mitosis. C) Metaphase lasts about twice as long as anaphase D) Cells spend less time in prophase than any other of the stages of mitosis.
Why would a person not get vitamin A from a salad filled with leafy green vegetables unless the salad also has some fat source such as nuts, cheese, or meat?
A) because vitamin A is fat-soluble B) because vitamin A is only found in meat C) because vitamin A is water-soluble D) because vitamin A is needed to maintain osmotic balance of human cells