Sarcoplasm is what?
What will be an ideal response?
Answer: Muscle cytoplasm
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Which of the following is true of nitrogen?
A. N2 is scarce in the atmosphere, therefore, plants must obtain other sources of nitrogen. B. Animals require nitrogen from the food they eat for the synthesis of carbohydrates and lipids. C. Nitrogen-fixing bacteria convert N2 into compounds plants can utilize. D. Nitrogen is plant food and, therefore, provides plants with energy.
This table shows the abundance of iridium in and near the K–T boundary layer. Depths are given as meters above or below the boundary layer. The iridium content of an average Earth rock is 0.4 parts per billion (ppb) of iridium. An average meteorite contains about 550 parts per billion of iridium. Which conclusion do these data best support?
1.the earth was struck by a large asteroid 65.5 million years ago
2.an asteriod collision caused a mass extinction that wiped out the dinosaurs
3.the K-T boundary indicates the beginning of an ice age
4.rates of evolution increased dramatically after the K-T boundary
Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?
A) CO2 and glucose B) H2O and O2 C) ADP, i, and NADP+ D) ATP and NADPH
Plastids are found in ________ cells
A) fungal B) animal C) plant D) bacterial