Visual pigments are made from opsin and ____

a. rhodamine
b. cytochromes
c. phytochromes
d. retinal
e. vitamin D


ANSWER: d

Biology & Microbiology

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The transport of two molecules across the cell membrane in different directions by one transporter is called ________

Fill in the blank with correct word.

Biology & Microbiology

How do leeches differ from other annelids?

a. They are aquatic. b. They do not have segmentation. c. They cannot reproduce sexually. d. They do not have a nervous system. e. They do not have setae or parapodia.

Biology & Microbiology

According to the animation, which compounds provide electrons to the system?

a. Water b. NADH c. Oxygen d. FADH2 e. NADH and FADH2

Biology & Microbiology

Of the following molecules, which passes through a lipid bilayer most readily?

A. carbon dioxide B. glucose C. K+ D. arginine E. RNA

Biology & Microbiology