Question

Which of the following cellular organelles is the site of translation during protein synthesis?

A. Cell membrane

B. Nucleolus

C. Golgi apparatus

D. Ribosome

In an experiment, a researcher counts the number of oxygen bubbles produced by water plants placed under different colors of light. The researcher finds that water plants placed under white light release more oxygen bubbles than water plants placed under red light. Which of the following statements is best supported based on the observation?

A. Light can break up water molecules to form oxygen.

B. White light increases photosynthesis in plants.

C. Red light has no affect on the release of oxygen from water plants.

D. An increase in temperature decreases the amount of oxygen produced by plants.

When normal atmospheric conditions are present, water is constantly being cycled between liquid and gaseous states by which of the following pairs of processes?

A. Turgor pressure and filtration

B. Melting point and condensation

C. Evaporation and condensation

D. Filtration and evaporation

Less-economically developed countries will experience higher birth rates than more-economically developed countries due to

A. decreased availability of sanitary water.

B. higher infant mortality rate.

C. higher literacy rate of women.

D. increased availability of contraceptives.

A student conducts an investigation in which she dissolves 1 gram (g) each of several substances in 50 milliliters (ml) of water. She has 12 identical plastic cups of water. She places 1 g of salt in three cups, 1 g of sugar in three cups, and 1 g of baking soda in three cups. Three cups contain only water. She places all the cups in a freezer and records the temperature in each cup every 15 minutes for 4 hours. Which of the following is the best way for the student to display the results of this investigation?

A. Pie chart

B. Bar graph

C. Venn diagram

D. Line graph

Answer 1

1. Translation is formation of proteins. With in the cytoplasm, there are small granular structures called ribosomes. A group of ribosomes attach to mRNA to form proteins.

D. Ribosomes.

2. White is more preferable for photosynthesis because it has large spectrum of light which can be absorbed by plant for photosynthesis. The absorbed light energy is used by chloroplasts to break water which not only releases O2 but also releases H+ ions and electrons.

B. White light increases photosynthesis in plants.

3.Water is continuously changing its state under certain conditions. It evaporates to form atmospheric vapor from the surface. When the temperature is lowered, it condenses to form liquid water.

C. Evaporation and condensation.

4. Less economically developed countries have more birth rate because of non-availability of contraceptives, lack of female education, more children will give more working hands etc. Higher mortality is another reason for increased birth rate. In more economically developed countries will have lower birth rate due to the life style chosen by the adults.

B. higher infant mortality rate

5. Because it is continuous data to be recorded and graphed line graph is best for such recording as graphs. Different colors can be used for each graph.

D. line graph