The resting potential of a neuron primarily is established by movement of _______ ions out of the cell.
Fill in the blank(s) with the appropriate word(s).
Ans: K+
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Sex-influenced traits are expressed ____
a. aftafter the formation of a Barr body b. more in males than in females c. as a result of hormone differences between males and females d. only in males e. only in females
For natural selection to occur, adaptive traits must be inheritable. This means that change occurs at the level of DNA. Answer the following question with this in mind
a. How do new traits develop? b. How may the genetic changes contribute to evolution by natural selection? c. How can the degree of similarity in DNA or protein sequence be used to infer the degree of relatedness between species?
Which of the following eye disorders is NOT necessarily correlated with age?
a. cataracts b. macular degeneration c. trachoma d. glaucoma e. the need for bifocal lenses
Touching a jellyfish can be a very painful experience whereas touching a comb jelly is not painful. Why is there a difference?
A. Ctenophores only use nematocycts for feeding, not for defense. B. Ctenphores do not possess nematocysts. C. Nematocysts in ctenophores lack venom. D. Ctenophores have very reduced nematocysts that cannot penetrate human skin.