The lampreys are unusual vertebrates in that they have no

(a) eyes.
(b) jaws.
(c) gill slits.
(d) mouth.


(d) mouth.

Biology & Microbiology

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The most direct ancestors of land plants were probably _____

A) kelp (brown alga) that formed large beds near the shorelines B) green algae C) photosynthesizing prokaryotes (cyanobacteria) D) liverworts and mosses

Biology & Microbiology

Which of the following statements about nucleotides is (are) true?

A) A nucleotide contains a nitrogenous base. B) A nucleotide contains a pentose. C) A nucleotide contains a phosphate group. D) All of the above statements are true.

Biology & Microbiology

Which of the following sugars is found in

RNA and NOT in DNA?

a. glucose b. deoxyribose c. deoxyribulose d. ribose e. ribulose

Biology & Microbiology

Mammalian erythrocytes (red blood cells) are particularly useful for studies of the plasma membrane because

a. they have few peripheral proteins. b. they have only one membrane, the plasma membrane. c. their plasma membrane is not associated with a cytoskeleton. d. their plasma membrane contains no cholesterol.

Biology & Microbiology