Nuclear pores are organized with _______ symmetry.
a. sixfold
b. eightfold
c. ninefold
d. tenfold
Ans: b. eightfold
You might also like to view...
Suppose an antibody to bindin and sea urchin sperm were mixed together and the mixture was added to eggs. You predict that the antibody-treated sperm will _____
A) fertilize the eggs normally B) fertilize eggs from other species C) not bind to the egg membrane D) not be able to swim toward the egg
The human oral flora consists of
A) a small group of phylogenetically related aerobic microorganisms. B) diverse aerobic and anaerobic microorganisms. C) monoculture biofilms on tooth surfaces. D) the same phyla that are found in the human gut.
A researcher decides to test the scientific validity of the common phrase “An apple a day keeps the doctor away.” What would be a valid hypothesis to investigate this specific question?
A. Eating apples decreases the frequency of contracting a cold. B. The daily consumption of a single apple does not change the number of visits to the doctor. C. Eating one apple every day is good for you. D. Apples are high in vitamin C. E. Those who consume apples have longer lifespans than those who do not consume apples.
The last shared ancestor for today's cell types is thought to have arisen about _____ years ago.
A. 5 million B. 2 million C. 3 billion D. 4 billion E. 6 billion