The receptive surface for pollen on an angiosperm flower is the

(A) anther

(B) corolla

(C) ovary

(D) style

(E) stigma

What is the term for the ordering of organisms into categories, such as orders or families?

How is breathing related to cell respiration? (Hint: Think about both the reactants and the products of cellular respiration)

In a sample of double-stranded DNA, 20 /, percent of the nitrogenous bases are guanine (G). What percentage of the nitrogenous bases in the sample are cytosine (C) ?

Considering the final steps in cholesterol biosynthesis, when squalene is eventually converted to lanosterol, which of the following statements is wrong? a. The action of squalene monooxygenase oxidizes C14 of the squalene chain, forming an epoxideb.

What is the basic level of an ecosystem?

What do enzymes react with? A. the products of chemical reactions B. the active site of the plasma membrane C. proteins in the cytoplasm D. a specific substrate

Isaac watched a movie where a tsunami washed across the coastline. He related the incident to the geology of the ocean he learned at the school. Which geological phenomenon did Isaac relate to? A. plate tectonics B. upwelling C.

How do mutations affect an organism? A. they may cause the development of a disease-causing allele B. they may cause the development of a more beneficial allele C. they, in some cases, may have no noticeable affect D. all of the above

Scientists make two types of observations that can be either

Of the following muscle types, which has the longest muscle cells and has obvious stripes called striations? Of the following muscle types, which has the longest muscle cells and has obvious stripes called striations? a. cardiac muscle b.