Which tissue is in direct contact with the external environment of an animal?
A) Epithelial B) Connective C) Nerve D) Endothelial E) Muscle
A
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When crossing an organism that is homozygous recessive for a single trait with a heterozygote, what is the chance of producing an offspring with the homozygous recessive phenotype?
A) 0% B) 25% C) 50% D) 75% E) 100%
Which of these is the site for protein modification?
a. nucleus b. cytoskeleton c. mitochondria d. rough endoplasmic reticulum e. nucleolus
How do hair cells of the cochlea translate vibration into nervous impulses?
A) Moving cilia break molecules at their bases. B) Pulling hairs trigger an action potential. C) Vibrating hairs open voltage sensitive channels. D) Bending cilia lead to ion flow and neurotransmitter release.
Which is NOT a mechanism of horizontal gene transfer (HGT)?
a. transduction b. transposition c. transformation d. Neither transduction nor transposition are HGT.