Which of the following is NOT a part of the cell theory?

In a laboratory experiment using spectrophotometry, an enzyme is combined with its substrate at time zero.  The absorbance of the resulting solution is measured at time zero and at five-minute intervals.  In this procedure, an increase in absorbance is related to the amount of product formed during the reaction.  The experiment is conducted using the three preparations shown in the table below. Absorbance of Solution at different times Enzyme Preparation 0 min 5 min 10 min 15 min 20 min I.    3 mL of enzyme preparation    2 mL of substrate   pH 5.0 0.0 0.22 0.33 0.38 0.37 II.    3 mL of boiled enzyme preparation      2 mL of substrate      pH 5.0 0.0 0.06 0.04 0.03 0.04 If you are trying to answer the question of the effect of temperature on enzyme activity, which group is the experimental group?

If a substance has a pH of 6, it is considered …

To study the actions of the enzyme catalase on hydrogen peroxide, students performed the following experiment.  Catalase was extracted from potatoes by blending raw potatoes in a blender with cold distilled water.  The filtrate was stored on ice.  The following hydrogen peroxide solutions were made: 1 %, 5%, 10%, and 15%. Filter paper disks were soaked in the catalase filtrate and dropped into beakers containing the various solutions.  The activity of the enzyme was measured by the amount of time it took for the disks to float to the surface of the solution on the bubbles produced by the reaction.  The following data were obtained. Time it takes for disks to float in different Hydrogen Peroxide concentrations Hydrogen Peroxide Solution Average Time, in seconds, for disks to float 1% 30 sec 5% 25 sec 10% 20 sec 15% 10 sec If the potato solution was boiled for 10 minutes and cooled for 10 minutes before being tested, the average time for the disks to float to the surface of the hydrogen peroxide solution would be

Figure 1 shows a model of how a channel protein influences the movement of a particle across a cell’s plasma membrane. Figure 1. A section of a cell’s plasma membrane, showing a channel protein and a concentration gradient across the membrane An investigator wants to understand whether a newly found membrane protein is involved in membrane transport of a certain particle. Which investigation will help determine whether the new membrane protein is a channel protein involved in membrane transport?  

  Which of the following best describes the numbered areas?

Which of the following terms describes a molecule that is attracted to water?

Which of the following is TRUE about hydrophobic molecules?

What is the correct hierarchy of order from smallest to largest for complex living things?

The large central vacuole in plant cells is primarily used for: