The outer membrane of gram-negative bacteria contains

a) sterols.
b) mycolic acid.
c) teichoic acid.
d) lipopolysaccharide.


Ans: d) lipopolysaccharide.

Biology & Microbiology

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In animals, one group of homeobox genes, the Hox gene family, regulates the development and location of structures

such as legs and wings along the anterior-posterior axis of the body.

a. True b. False

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Most species of vertebrates are iteroparous

Indicate whether the statement is true or false

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For each of the following organelles or structures, check the corresponding box if the organelle or structure is named or discussed in the animation.

A) lysosomes B) the nucleus C) mitochondria D) the Golgi apparatus E) ribosomes

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To engulf a bacterium, a white blood cell would use ____

a. facilitated diffusion b. osmosis c. phagocytosis d. exocytosis e. sodium-potassium pumps

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