Given that oxygen is toxic to anaerobic bacteria, describe how they must have adapted to survive in the present environmental conditions on Earth
What will be an ideal response?
These bacteria must have evolved at a time when oxygen was scarce or non-existent in the atmosphere and in the oceans. Rather than evolving mechanisms of tolerating oxygen toxicity, they have remained anaerobic by living in anaerobic environments.
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Answer the following statements true (T) or false (F)
1.Grasslands, forests, lakes, and deserts are all examples of terrestrial biomes. 2.The rain shadow of a mountain is found on the downwind side of the mountain. 3.All deserts are characterized by being hot and dry. 4.Streams include brooks, creeks, and rivers that carry water and sediment toward the ocean or an interior basin. 5.Nutrient-rich lakes are termed oligotrophic.
what does the so called immune checkpoint blockade do?
What will be an ideal response?
This enzyme will break down starch into smaller subunits
A) amylase B) lipase C) pepsin D) renin
An osmosis investigation was conducted using chicken eggs to represent cells with semi permeable membranes. The mass of each egg was measured to determine how much water diffused into or out of the eggs. The eggs were first soaked in vinegar to dissolve the shell. Each egg was then placed in one of three different solutions for 24 hours. The table below shows the results of the investigation. Based on this experiment, which of the following should be inferred about cells with semi permeable membranes?
A. Substances other than water may also cross the cell membrane. B. Substances other than water may block pores in the cell membrane. C. Water enters the cell when placed in environments of high water concentration. D. Water leaves the cell when placed in environments with a low concentration of solutes