Which of the following processes does NOT require the cell to spend energy?
a) endocytosis
b) active transport
c) facilitated transport
d) endocytosis
Ans: c) facilitated transport
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The rolled tube method is most commonly used for isolating which grouping of microorganisms?
A) anaerobes B) chemolithotrophs C) chemoorganotrophs D) aerobes
A student in a histology class was asked to describe the structure of a stratified squamous epithelium. Which one of the following is the best description?
A) tissue composed of protein fibers in a ground substance and a few cells B) tissue composed of one layer of flat cells located on a basement membrane C) tissue composed of contracting protein fibers enclosed by plasma membranes D) tissue composed of several layers of tall cells resting on a basement membrane E) tissue composed of several layers of flat cells resting on a basement membrane
As electrons travel from the primary electron acceptor in photosystem II down the electron transport chain to photosystem I, they drive the movement of protons from the stroma into the thylakoid compartment. Why is the development of this chemical gradient useful to photosynthesis?
A. Protons are directly used in the thylakoid to make glucose B. The proton gradient can drive the production of ATP, which is needed for the light-independent reactions C. Protons provide the energy needed to drive the light-dependent reactions D. This proton gradient is used to make NADPH, which is needed for the Calvin cycle
Which structures make up the outermost whorl of a flower?
a. the receptacles b. the carpels c. the petals d. the sepals