A ________ is a group of organisms related by their ancestry.
Fill in the blank(s) with the appropriate word(s).
clade
A clade is a group of organisms related by their ancestry.
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A circular molecule of DNA devoid of any histone proteins describes the chromosome of a (an):
A. protozoa B. yeasts C. insects D. flowering plants E. bacteria
As part of their normal function, many proteins bind to DNA briefly and then release it again. Which types of bonds might be involved in these transient protein-DNA interactions?
a. ionic b. covalent c. van der Waals forces d. hydrogen e. all of the above f. a, c, and d g. a, b, and c
Which of the following genera grow symbiotically within root nodules of legumes as nitrogen-fixing bacteroids?
A. Bacteroides B. Rhizobium C. Agrobacterium D. Nitrosomonas
Which of the following characters was not an ancestral trait that facilitated the colonization of land by an animal group?
a. Amniotic egg b. Exoskeleton of arthropods c. Lungs d. Vertebrate skeleton e. Arthropod cuticle