In animal eggs, once fertilization occurs, ________ are the second messengers that trigger egg activation.

Fill in the blank(s) with the appropriate word(s).


calcium ions

Biology & Microbiology

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The protein-coding gene sequences in humans and chimpanzees 

A. are vastly different. B. are about 50% alike. C. are about 80% alike. D. are more than 99% alike. E. are identical.

Biology & Microbiology

Using the cladogram shown in Figure 10.3, which two organisms are most closely related?

A) Streptomyces and Lactobacillus B) Mycobacterium and Lactobacillus C) Micrococcus and Mycobacterium D) Streptomyces and Micrococcus E) Streptomyces and Mycobacterium

Biology & Microbiology

The portion of the molecule in box 3 of Figure 12-1 is:


a. a sugar.
b. a protein.
c. a pyrimidine.
d. a purine.
e. a nucleotide.

Biology & Microbiology

Enamel like scales on primitive fish (lungfish and coelocanths)

A) placoid B) ctenoid C) plasmoid D) cosmoid

Biology & Microbiology