You are studying the effects of the proliferation of farmlands on the natural prairie grasslands of North America. Which kind of diversity would be affected by this construction?
a) ecosystem diversity
b) conservation diversity
c) landscape diversity
d) species diversity
e) genetic diversity
Ans: a) ecosystem diversity
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Which one of the following explains why rRNAs are the most abundant type of RNA in a mammalian cell?
A. There are more different types of rRNA genes than all other types of genes combined. B. There are rRNAs in ribosomes, and it takes millions of ribosomes to translate all the proteins required for a cell's functions. C. A different type of ribosome is needed to synthesize all of a cell's proteins, and because most proteins are present in multiple copies, a huge number of ribosomes are needed. D. It takes several rRNAs to transcribe a single mRNA, so there are many more rRNAs needed in a cell than the number of proteins synthesized. E. None of the above; rRNAs are not the most abundant type of RNA in a mammalian cell.
Why are epithelial membranes not very thick?
A. Epithelial tissues can only reach a certain thickness because their growth is constrained by microtubules inside the cell membrane. B. Thick epithelial tissues would collapse due to the drying effect of the environment. C. Epithelial tissues are programmed to stop dividing after only a few cell cycles. D. Epithelial tissues are required to support other cells growing on top of the tissue. E. Epithelial tissues play a critical role in transport and must be thin to allow diffusion to occur.
Which of the following is not one of the seven main groups of odors that humans can detect?
a. musk b. floral c. herbaceous d. putrid e. peppermint
Naturally occurring mutations are often referred to as ________ mutations
A) neutral B) unnoticed C) spontaneous D) insertion E) deleterious