How are X rays used in the technique of X-ray diffraction?
A) The scattering of X rays by a purified form of a molecule reveals its structure.
B) Cells are broken open to release chromosomes by being bombarded with X rays.
C) DNA strands are separated by X-ray energy, revealing the order of bases.
D) The X rays are used to mutate DNA to determine the location of genes.
E) Enzymes are destroyed by X rays, revealing the order of steps in metabolism.
Answer: A
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Which of the following statements concerning complex multicellular organisms is true?
A. Plants and animals use bulk transport systems to move gasses and nutrients, but fungi and algae do not. B. Bulk transport systems require specialized organs like a heart to pump nutrients and dissolved gasses deep into tissues that are not in contact with the external environment. C. Bulk transport systems move substances faster than simple diffusion.
Which of the following linkage maps correctly shows the order and distance between the y, f, and v genes?
In Drosophila, the genes y, f, and v are all X-linked. Females who are homozygous for recessive alleles of all three genes (y f v / y f v) are crossed to wild-type males. The resulting trihybrid F1 females are testcrossed. The F2 are distributed as follows:
A) f——35 m.u.——y——15 m.u.——v
B) f——22 m.u.——y——15 m.u.——v
C) y——35 m.u.——f——22 m.u.——v
D) y——22 m.u.——v——15 m.u.——f
E) y——15 m.u.——v——22 m.u.——f
What term describes an exotic species that thrives in a new habitat and quickly threatens the existing environment?
a. a pest species b. a keystone species c. an advanced predator species d. an invasive species
What is the limbic system? What does it control?
What will be an ideal response?