All of the following contain amino acids EXCEPT _____
A) hemoglobin
B) cholesterol
C) enzymes
D) insulin
B
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Why do skates and rays have flattened bodies, while sharks are torpedo shaped?
A) Sharks have a strong cartilaginous skeleton that helps them maintain a tubular shape, while skates and rays lack such a skeleton. B) Sharks are more closely related to the tubelike lampreys than skates and rays are. C) Skates and rays need enlarged pectoral fins to help them stay level in turbulent water, while sharks do not. D) Skates and rays exchange gases across their skin and thus require a high surface-area-to-volume ratio, while sharks use gills to respire. E) Sharks are streamlined for active swimming off the bottom, while skates move about mostly on the ocean bed.
In the frog genus, when certain species attempts to mate with other species, embryo development is halted at various stages including zygotic segmentation, blastula formation, gastrulation, or in the final phases of embryo development
The stage where the developing frog arrests depends on the species involved in the cross. This is an example of A. hybrid breakdown. B. hybrid sterility. C. hybrid inviability D. sexual isolation.
Who discovered that DNA was the genetic material or transforming factor that could convert nonvirulent R-type Streptococcus pneumoniae bacterium to the virulent S-type?
A. Weismann and Nageli B. Griffith C. Avery, MacLeod, and McCarty D. Hershey and Chase E. Watson, Crick, Wilkins, and Franklin
Insects have an excretory system consisting of Malpighian tubules. Indicate whether the statement is true or false