It has been suggested that scientists should attempt to genetically engineer a plant to have black leaves so that it would perform photosynthesis more efficiently. What is the likely reason behind this idea?
A) Black plants would heat up faster and therefore all chemical reactions including photosynthesis would operate faster.
B) A black plant would reflect all wavelengths and therefore have more energy to drive photosynthesis.
C) A black plant would absorb all wavelengths and therefore absorb more light energy that powers photosynthesis.
D) A black plant would absorb green wavelengths like most plants, but would absorb them more efficiently.
Answer: C
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An individual who avoids the pull of gravity is exhibiting
(a) negative phototaxis. (b) positive geotaxis. (c) negative geotaxis. (d) positive thigmotaxis.
Which one of the following occurs when a phosphate is removed from an ATP molecule?
A) Energy is added to the ATP molecule to form ADP. B) Oxygen produced in the reaction causes the molecule to explode. C) Energy is released for cell work. D) Chemical reactions stop in a cell due to lack of an energy source. E) Fat is converted to protein.
The leaves of a plant typically have different tissue layers that function in different ways. The epidermis layer functions like a covering of skin to protect the leaf while vascular bundles carry water and nutrients through the leaf. The palisade mesophyll layer is responsible for most of the photosynthesis that occurs while the spongy mesophyll layer underneath it aids in the exchange of gases (CO2 and O2) and water vapor. In which leaf tissues would you expect to find the highest density of chloroplasts?
a. epidermis b. vascular bundles c. spongy mesophyll d. palisade mesophyll
Dolly the sheep ________
A) was the first mammal cloned from an adult cell B) was the first mother who gave birth to a cloned sheep C) received its mother's nucleus from her bone marrow D) received its nuclear DNA from the foster mother