Which of the following descriptions best fits viroids?
a. prokaryotic cells that live on or in animal cells
b. a DNA or RNA genome with a protein coat
c. a single-celled eukaryote classified with the fungi
d. the smallest pathogens made of naked circular RNA
d
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What region of a steroid is hydrophilic?
A) the methyl (-CH3) groups B) the terminal hydroxyl group C) the ring structures D) the long hydrocarbon chain
What would happen if the body did not produce glucagon?
A. Cells of the body would keep on releasing glucose into the blood stream, even when glucose levels were high in the blood stream. B. Cells of the body would not release glucose into the blood stream when glucose levels were low in the blood stream. C. Cells of the body would keep on taking glucose from the bloodstream and storing it. D. Cells of the body would neither take in glucose from the bloodstream nor release it into the blood stream.
Answer the following statements true (T) or false (F)
1. In red-winged blackbirds, females tend to choose males with the most desirable territories and males compete with each other for territories. Redwing blackbirds demonstrate both intersexual selection and intrasexual selection. 2. Cryptic female choice is a type of intrasexual selection. 3. A population undergoing microevolution would show Hardy-Weinberg disequilibrium. 4. The Mexican axolotl (Ambystoma mexicanum) is an amphibian that has a derived mode of development characterized by metamorphic failure. This mode of development results in an entirely aquatic life cycle and is an example of paedomorphosis.
What stage of development involves cell division without cell growth?
A. gastrulation B. organogenesis C. fertilization D. cleavage E. neurulation