Why do men get 'Morning Wood', and what causes it?

True or false there are two kinds of cells animals and fish known to exist.

Rosalind Franklin used very uniformly oriented DNA fibers prepared by Maurice Wilkins to perform X-ray crystallography.

The Linnaean system of classification sorts organisms into groups using a hierarchical system of levels. List the following terms correctly in the Linnaean classification system from the most general to the most specific.

If a rock disintegrates by chemical weathering into small grains of similar composition, would this be considered reproduction? yes no

When the cell excretes sodium from within, against the natural tendency of matter, it is performing

The failure of homologous chromosomes to separate during meiosis is called a. skin disorders b. translocation. c. nondisjunction. d. Down syndrome.

As the wavelength increases, the frequency (A) decreases and energy decreases. (B) increases and energy increases. (C) decreases and energy increases. (D) increases and energy decreases.

The most obvious source of gene flow into any population is A) Emigration B) Immigration

Polypeptides and proteins must fold properly to be functional. Hydrogen bonds between the oxygen and nitrogen atoms of the peptide bonds are crucial to which level of protein structure?1. primary structure2. tertiary structure3. secondary structure4.

A particular gene can have two forms, called alleles. which statement best describes the difference between the dominant allele and the recessive allele? (a) only the recessive allele is expressed when both alleles ate inherited.