List two essential roles of ribosome during translation. (NCERT)

The true statement about ‘green-house effect’ is that it is

(a) caused by combination of many gases

(b) caused only by CO₂

(c) caused by CO₂, CFC, CH₄ and NO₂ gases

(d) none of these.

Which of the following is the most stable ecosystem?

(a) mountain

(b) ocean

(c) forest

(d) desert.

Green house effect is warming due to

(a) infra-red rays reaching earth

(b) moisture layer in atmosphere

(c) increase in temperature due to increase in carbon dioxide concentration of atmosphere

(d) ozone layer of atmosphere.

1. What are storage granules, and why are they important to the cell?

2. Why do you need a special staining procedure for flagella?

1. In this question, circle the best answer within the parentheses. FR = functional response.

a. Compare search time: FR 1(> / = / <) FR 3.

b. Compare handling time: FR 1 (> / = / <) FR 2.

c. Which portion of the type 2 functional response isinfluenced by search time (low prey density/ high prey density), and handling time (low prey density / high prey density)?

2. One mechanism suggested to maintain biodiversity is that a species has relatively high performance when it is rare (regardless of environmental factors). Which functional responsewould help maintain biodiversity in this way? _________

3. For animals, tradeoffs may exist between foraging and predator avoidance, because time spent being vigilant against predators is time lost from feeding. Based on the principle of allocation, and considering ways that plants avoid herbivores, describe a tradeoff for plants.

Soil fertility is reduced by

(a) crop rotation

(b) nitrogen fixing bacteria

(c) decaying organic matter

(d) intensive agriculture.

Explain how ATP levels regulate glycolysis in resting muscle

biochemistry

Describe the β-oxidation of the fatty acid palmitate.

biochemistry

The following chemicals have the indicated formula weights:

Sucrose -- 342.3g/mol

Potassium dihydrogen phosphate (KH2P04) -- 136.09g/mol

You also have the following solutions already made: 20% SDS, 5M NaCl and 10X TAE List the steps to make the following buffers (be specific and show calculations):

a. 1 liter of a solution containing: 0.5 M sucrose, 0.05 M NaCl, 0.02 M KH2PO4.

b. 100 ml of 10% SDS, 1M NaCl.

c. 40 ml 0.5% agarose in 1X TAE solution (calculate for both agarose and 1X TAE).

What environmental damage are caused by mercury pollution? What are the main sources of mercury pollution?

What are the typical features of the age pyramids of underdeveloped countries?

What is the typical shape of a population growth curve? How can biotic potential be represented in the same way graphically?

What is the difference between primary ecological succession and secondary ecological succession?

How can a large amount of biological diversity protect an ecosystem from environmental damage? Why are less biodiverse ecosystems at risk of suffering serious biological harm if subject to even small changes?