To get into the nucleus a component has to have the correct signal sequence and pass through a nuclear pore.
a. true
b. false
Ans: a. true
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After acrosomal reactions occur in one location, why does an egg release proteins in other locations?
a. To prevent multiple sperm from fertilizing the egg b. To ensure that rapid cell division takes place c. To protect the developing embryo d. To allow implantation of a blastocyst
The teeth designated by the letter “A” in the above
figure are called a. canines. b. premolars. c. incisors. d. molars. e. none of these.
How are brassinosteroids different from animal steroid hormones?
a. BRs regulate only cell division. b. BRs are enzyme-linked receptors. c. BRs bind with intracellular receptors. d. BRs have a histidine kinase that extends into the cell. e. BRs bind with a protein kinase receptor in the plasma membrane.
A. thaliana, or Arabidopsis, is a common weed. Biologists have selected it over hundreds of thousands of other flowering plant species to serve as an experimental model organism because __________________
(a) it can withstand extremely cold climates. (b) it can reproduce in 8–10 weeks. (c) it produces thousands of offspring per plant. (d) Both (b) and (c) are true.