Alpha helices and beta sheets are characteristic of protein

A) primary structure.
B) secondary structure.
C) tertiary structure.
D) quaternary structure.
E) enzymatic structure.


B

Biology & Microbiology

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Unlike other prokaryotes, archaeons (except Sulfolobus) have two origins of replication.

Answer the following statement true (T) or false (F)

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The algal ancestors of land plants are most likely similar to the ____

a. Rhodophyta b. Phaeophyta c. Chrysophyta d. Charophyta e. Radiolaria

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Immune system cells differentiate between self and foreign cells by their ________.

A. markers B. sizes C. shapes D. cell processes E. cell walls

Biology & Microbiology

The sizes and shapes of chromosomes can be observed most easily in a cell that is in

a. prophase. b. metaphase. c. anaphase. d. telophase. e. cytokinesis.

Biology & Microbiology