Which of the following electron carriers transfers both protons and electrons?
A) cytochrome a
B) cytochrome b
C) coenzyme Q
D) iron-sulfur proteins
E) iron-copper proteins
Answer: C
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The region of a plant that is composed of undifferentiated cells is called the ________
a. roots b. dermal tissue c. meristems d. cotyledon e. ground tissue
Which of the following is a negative regulator of the cell cycle?
a. cyclin b. human growth hormone (HCG) c. p53 d. cyclin-dependent kinase (Cdk)
Which statement describes suspension feeders?
a. They may inject anticoagulants into a host to inhibit blood from clotting. b. They may have long tongues to effectively extract nectar from plants. c. They may have comblike plates called baleen. d. They may have piercing mouth parts to obtain blood from a host.
Many types of cancer cells have been detected to secrete significant levels of lactate. Do you think these cells are likely undergoing beta-oxidation?
A. Yes, because lactate stimulates beta-oxidation. B. Yes, because beta-oxidation can generate intermediates that would lead to the production of lactate. C. No, because lactate is consumed in beta-oxidation D. No, because if lactate is being produced, the cell is not likely making use of the pathways needed to make use of the products of beta-oxidation.