Proteins function in modern cells as
A. structural elements.
B. hereditary information.
C. catalysts.
D. both catalysts and structural elements.
Answer: D
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__________ occurs when two species act as agents of selection upon one another. Fill in the blank(s) with the appropriate word(s)
Bacteria reproduce via?
A) binary fission B) mitosis C) fusion D) meiosis
What is a photosystem?
A) Stacks of thylakoids B) A double-membrane organelle containing thylakoids C) Clusters of pigments and proteins that capture light energy D) A leaf or any green part of the plant
The Japanese puffer fish, a food delicacy, contains the chemical tetrodotoxin (TTX). If too much TTX is ingested, this
can prevent breathing because TTX:a. binds to and activates voltage-activated K+ channels. b. binds to and activates voltage-activated Na+ channels. c. blocks the passage of Ca+ through voltage-activated Ca+ channels. d. blocks the passage of Na+ through voltage-activated Na+ channels. e. blocks the passage of K+ through voltage-activated K+ channels.