When a moss spore lands on an appropriate site, it germinates into the first stage of the gametophyte called a(n)
A. prothallus.
B. archegonium.
C. antheridium.
D. rhizoid.
E. protonema.
Answer: E
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Three genes (X, Y, and Z) are in the same region of a bacterial chromosome. To determine the order of these genes, you infect X?Y?Z? cells with a lysate from wild-type cells infected with a generalized transducing phage. When X+ cells are selected, 70% of cells are also Y+ and 5% of cells are Z+. When Y+ cells are selected, 68% of cells are also X+ and 1% are Z+. What is the relative arrangement of the three genes?
A) Z is in the middle, but closer to X. B) Y is in the middle, but closer to Z. C) X is in the middle, but closer to Y. D) X is in the middle, but closer to Z.
Donation for research is an important use of
A) extra embryos from ARTs. B) embryos from failed IVFs. C) the extra cells from preimplantation genetic diagnosis. D) savior siblings.
Which bone is NOT part of the pectoral girdle or upper limbs?
a. tibia b. clavicle c. scapula d. humerus e. radius
What do carbohydrates, lipids, and proteins have in common?
A) All are important enzymes that function within the cell. B) All are inorganic molecules. C) Covalent bonding holds these molecules together. D) Polymers of these organic molecules form monomers via dehydration synthesis reactions.