The X chromosome ____
a. carries the SRY gene
b. is present in two copies in males
c. pairs with an autosome during meiosis
d. carries many genes that are not involved in sex determination
e. is not present in males
ANSWER: d
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While analyzing data from the prior week, a chemist determines that she has discovered a new type of atom. While the atom has the same number of protons as nitrogen, the number of neutrons is different. What has she discovered?
a. an isomer b. an ion c. an isotope d. a compound
A restriction map provides the location of sites cleaved by restriction enzymes
Indicate whether the statement is true or false
The primary role of the two sperm produced in the germ tube of the pollen is to
A. release proteins for germination B. aid the plant's seed production C. ensure that there will be fertilization of the egg and the two central cells D. ensure production of an embryo E. allow the endosperm to become a seed
Describe the shared derived characteristics that support grouping the hemichordates, chordates, and
echinoderms together as deuterostomes. What will be an ideal response?