Where is the auxin receptor ABP1 located in plant cells?
a. cell wall
b. cytoplasm
c. endoplasmic reticulum
d. plasma membrane
e. nucleus
ANSWER: d
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Which of the following statements about phloem unloading at sinks is inconsistent with our current understanding?
A) Passive transport plays a role. B) Regardless of the type of sink, the conversion of sucrose to storage compounds such as starch is a major part of the process. C) The mechanisms of sucrose movement and the membrane proteins involved vary among different plant species. D) The mechanisms of sucrose movement and the membrane proteins involved vary among different sinks within a plant. E) Active transport plays a role.
Which of the following has X-linked recessive inheritance?
a. Duchenne muscular dystrophy b. phenylketonuria c. achondroplasia d. sickle-cell anemia e. cystic fibrosis
Which of the following is not a property of
living things? a. They can change over generations. b. They use DNA as the genetic material. c. They change over their lifetime. d. They engage in processes to maintain homeostasis. e. All of these are true
Membrane synthesis in the cell requires the regulation of growth for both halves of the bilayer and the selective retention of certain types of lipids on one side or the other. Which group of enzymes accomplishes both of these tasks?
(a) flippases (b) phospholipases (c) convertases (d) glycosylases