Gene families are groups of _______ genes that arose by _______ and _______.

Large animals need specialized organs for gas exchange because ________.

Lepirudin is a drug that inhibits thrombin. it will have an effect specifically on the __________.

Most autistic individuals develop symptoms of the disorder ________.

Moving through trophic levels _______.

Obesity is defined as having a body mass index of ______ or higher.

Typical eukaryotic genomes are composed of ________ dna molecule(s).

The way that proteins fold into beta pleated sheets and alpha helices is dependent on their _____.

The trp (tryptophan) operon is an example of a(n) __________ operon.

The trna anticodon, gac, is complementary to the mrna codon with the sequence _____.

X-linked recessive traits in humans (or in drosophila) are observed ________.