The larvae of some insects are merely small versions of the adult, whereas the larvae of other insects look completely different from adults, eat different foods, and may live in different habitats
Which of the following is most directly involved in the evolution of these variations in metamorphosis?
A) artificial selection of sexually immature forms of insects
B) changes in the homeobox genes governing early development
C) the evolution of meiosis
D) the development of an oxidizing atmosphere on Earth
E) the origin of a brain
Answer: B
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An elephant’s trunk does not have any bones. However, it has many muscles, and the tip has
very precise movements that allow it to pick a single leaf from a tree. What type of skeleton allows this movement to occur?
a. hydrostatic skeleton b. exoskeleton c. antagonistic skeleton d. pressurized skeleton
Despite advances in microscopy during the late 1800s and early 1900s, experiments using bacteria as test subjects required careful precautions to prevent contamination that would have invalidated results. What advantage did bacteria have over other, larger organisms that could be used as test subjects, such as mice and pea plants?
a. Larger organisms used as test subjects are more susceptible to injury and disease. b. Bacteria do not require specialized equipment to be stored and transported like other test subjects. c. Bacteria reproduce rapidly, allowing experiments to be conducted and repeated more often. d. Unlike mice and pea plants, bacteria can be frozen for display without cellular damage.
In an Hfr × F? mating, the conjugation bridge usually breaks before chromosomal transfer is complete. Therefore, the recipient remains F?.
Answer the following statement true (T) or false (F)
?
What is the key activity of panel II in the accompanying figure?
A. The enzyme is consumed as the products form. B. The substrate leaves the active site. C. The conversion of substrates to products occurs. D. The product leaves the enzyme. E. The product decomposes to the reactants.