Monotremes
A. include the anteater and duck-billed platypus.
B. are egg laying mammals.
C. nurse their young.
D. All of the answer choices are correct.
Answer: D
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Put the following steps of DNA replication in chronological order
1. Single-stranded binding proteins attach to DNA strands. 2. Hydrogen bonds between base pairs of antiparallel strands are broken. 3. Primase binds to the site of origin. 4. DNA polymerase binds to the template strand. 5. An RNA primer is created. A) 1, 2, 3, 4, 5 B) 2, 1, 3, 5, 4 C) 3, 2, 1, 5, 4 D) 3, 1, 2, 4, 5
Which of the following statements is true?
A. Tracheids are multicellular conduits, whereas vessels are unicellular conduits. B. Tracheids transport water, whereas vessels transport sugars. C. Tracheids are short and thin, whereas vessel elements are much wider. D. Tracheids compose the xylem, and vessel elements compose the phloem. E. Water enters tracheids through pits, whereas water enters vessels only through spaces between the cells.
Although the most frequent forms of Down syndrome are caused by a random error, nondisjunction of chromosome 21, Down syndrome occasionally runs in families. The cause of this form of familial Down syndrome is ________
A) an inversion involving chromosome 21 B) too many X chromosomes C) a chromosomal aberration involving chromosome 1 D) a translocation between chromosome 21 and a member of the D chromosome group E) a maternal age effect
Which of the following statements concerning plasma cells is FALSE?
A. They live for many years and function as memory cells. B. They are descended from activated B cells. C. They can produce large quantities of antibodies on a daily basis. D. They secrete a single type of antibody molecule specific for a single epitope. E. The antibodies they produce can remain in circulation for weeks.