At what level is biodiversity often studied and measured?
A. The diversity of species in a community
B. The diversity of ecosystems on the planet
C. The diversity of genes in a population
D. All of the above
Answer: D
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Kinetochore microtubules assist in the process of splitting centromeres by _____
A) using motor proteins to split the centromere at specific arginine residues B) creating tension by pulling toward opposite poles C) sliding past each other like actin filaments D) phosphorylating the centromere, thereby changing its conformation
Introducing a gene in a liposome to carry DNA across the plasma membrane is a(n) ________ gene therapy.
A) in situ B) ex vivo C) in vivo D) ex hubris E) et al
Which action is LEAST likely to reduce cancer risk?
a. restricting alcohol intake b. beginning estrogen replacement therapy after menopause c. maintaining a desirable weight d. avoiding tobacco e. avoiding direct sun exposure
In a reptile egg, which membrane is analogous to a lung?
A) Amnion B) Allantois C) Yolk sac D) Blastocyst E) Chorion