Most moss gametophytes do not have a cuticle and are 1-2 cells thick. What does this imply about moss gametophytes and their structure?
A) They use stomata for gas exchange regulation.
B) They can easily lose water to, and absorb water from, the atmosphere.
C) Photosynthesis occurs throughout the entire gametophyte surface.
D) They have branching veins in their leaves.
Answer: B
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Which of the following statements about Hymenoptera is not correct?
A. They exhibit care of the young with clear and consistent division of labor between reproducer (queen) and non-reproducers (workers). B. Group benefits come from living in and defending the nest. C. Sex determination includes diploid females (queen and workers) and haploid males (drones). D. Degree of relatedness (r) is higher for sister–sister relationships (0.75) than for mother–daughter relationships (0.5). E. In terms of genetic representation in the next generation, it is better for the workers to produce more offspring rather than help the mother produce more sisters.
The benefit provided by all hearts with two atria is
A. not all the blood has to pass through both sides of the heart. B. there is an extra place to store blood when the animal is at rest. C. that there are two muscular regions for pumping blood out of the heart to different organs. D. that blood is pumped into body tissues at high pressure. E. complete separation of oxygenated and deoxygenated blood.
Which of the following numbered events represents the correct sequence of events of prokaryotic translation
initiation? 1) large ribosomal subunit binds to initiation complex 2) initiation tRNA binds small ribosomal subunit 3) initiation complex binds to ribosome recognition sequence on mRNA a. 1 ? 2 ? 3 b. 1 ? 3 ? 2
c. 2 ? 1 ? 3 d. 2 ? 3 ? 1 e. 3 ? 2 ? 1
If you were to think of the cell as a car, and mitosis as a process that drives that car to go, what would be a good analogy for a cell that has a mutation in both copies of a tumor-suppressor gene?
A. The gas pedal of a car gets stuck while pushed down. B. The brake pedal of a car gets stuck while pushed down. C. The brake pedal of a car does not work at all. D. The gas pedal of a car does not work at all.