Small lipid soluble molecules would move through the plasma membrane by

Choice A rationale: A cover slip is correct because a cover slip is a thin, transparent piece of glass or plastic that can be placed over the specimen on the slide. A cover slip protects the specimen from drying out, dust, or damage, and creates a flat surface for viewing under the microscope.

Choice B rationale: Clear paper is incorrect because clear paper is not suitable for covering a wet mount specimen. Clear paper is a type of paper that is transparent or translucent, but it is not thin or flat enough to fit over the specimen on the slide. Clear paper can also interfere with the passage of light or distort the image of the specimen.

Choice C rationale: Transparent tape is incorrect because transparent tape is also not suitable for covering a wet mount specimen. Transparent tape is a type of adhesive tape that is clear or see-through, but it is sticky and can damage the specimen or the slide. Transparent tape can also affect the quality of the image or the focus of the microscope.

Choice D rationale: Another glass slide is incorrect because another glass slide is too thick and heavy to cover a wet mount specimen. Another glass slide is a thin, flat piece of glass or plastic that can be used to place the specimen on, but not over it. Another glass slide can also crush the specimen or block the light source of the microscope.

Choice A rationale: Chlorophyll is the molecule that traps the sun's energy and initiates the process of photosynthesis. Photosynthesis is the process by which plants convert light energy into chemical energy, stored in the bonds of sugar molecules. Chlorophyll is a green pigment that is found in the thylakoid membranes of the chloroplasts, the organelles where photosynthesis occurs. Chlorophyll absorbs red and blue light from the sun and reflects green light, giving plants their characteristic color. Chlorophyll also transfers the light energy to electrons, which are then used to split water molecules and generate ATP and NADPH, the energy intermediates for the dark reaction of photosynthesis¹².

Choice B rationale: ATP is not the molecule that traps the sun's energy, but an energy molecule that is synthesized by the light reaction of photosynthesis. ATP stands for adenosine triphosphate, and it consists of a nitrogenous base, a sugar, and three phosphate groups. ATP stores energy in the bonds between the phosphate groups, and releases energy when one of the bonds is broken, forming ADP (adenosine diphosphate) and Pi (inorganic phosphate). ATP provides energy for the dark reaction of photosynthesis, which uses CO2 to produce glucose, a type of sugar³⁴.

Choice C rationale: Chloroplast is not the molecule that traps the sun's energy, but the organelle where photosynthesis occurs. Chloroplast is a membrane-bound structure that is found in the cytoplasm of plant cells. Chloroplast contains its own DNA and ribosomes, and can divide independently of the cell. Chloroplast has two main parts: the stroma, which is the fluid-filled space inside the chloroplast, and the thylakoid, which is a system of flattened sacs that contain chlorophyll and other pigments. The light reaction of photosynthesis takes place in the thylakoid, while the dark reaction takes place in the stroma⁵⁶.

Choice D rationale: Glyceraldehyde-3-phosphate is not the molecule that traps the sun's energy, but an intermediate molecule in the dark reaction of photosynthesis. Glyceraldehyde-3-phosphate, also known as G3P, is a three-carbon sugar that is formed from CO2 and energy intermediates from the light reaction. G3P can be converted to glucose, which is the main product of photosynthesis, or to other organic molecules, such as amino acids, lipids, and nucleotides. G3P can also be recycled to regenerate the five-carbon starter molecule called ribulose, which is needed for the dark reaction to continue⁷⁸.

Choice E rationale: Rubisco is not the molecule that traps the sun's energy, but an enzyme that catalyzes the first step of the dark reaction of photosynthesis. Rubisco stands for ribulose-1,5-bisphosphate carboxylase/oxygenase, and it is the most abundant protein on Earth. Rubisco combines CO2 with ribulose, a five-carbon sugar, to form a six-carbon intermediate that splits into two molecules of G3P. Rubisco is also responsible for a wasteful process called photorespiration, in which it binds O2 instead of CO2, resulting in the loss of carbon and energy⁹ .