The area labeled “C” is
a. a nucleus.
b. chromatin.
c. endoplasmic reticulum.
d. a vacuole.
e. a nucleoid.
Answer: c
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____ is defined as the percentage of cases in which both members of a pair of twins show the trait when it is known that at least one member shows it
Fill in the blank with the appropriate word.
The secretory systems of Type III and Type IV pathogenic bacteria differ in their mode of attacking cells in what way?
A. Type III systems bind to the cellular membrane by slimy mucilage and toxins diffuse across the membrane, whereas Type IV systems infect cells using pili as transfer tubes. B. Type III systems infect cells using pili as transfer tubes whereas Type IV systems bind to the cellular membrane by slimy mucilage and toxins diffuse across the membrane. C. Both systems attach to cells in the same way but they differ merely in the chemicals that they inject into the host cell. D. Type III systems use flagella modified as "syringes" to inject materials into cells they are infecting whereas Type IV systems use modified pili as transfer tubes. E. Type III systems use modified pili as transfer tubes whereas Type IV systems use flagella modified as "syringes" to inject materials into cells they are infecting.
Which class of gnathostomes is extinct?
a. Sarcopterygii b. Actinoptertygii c. Acanthodii d. Holocephali
Which of the following is an example of an ultimate cause of animal behavior?
A. Variation in hormone receptors governing promiscuity in rodents B. Competition for food resulting in the larval foraging behaviors of fruit flies C. Social environment determining the dominant role in male cichlids D. Phenotypic variation in response to water depth in fish E. Conditioned response in animals