The light microscope was used to observe the cellular structure of cork by _______, who named the chambers "cells."
a. Schleiden and Schwann
b. Hooke
c. Virkow
d. Pasteur
Ans: b. Hooke
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In order to be useful for constructing a phylogeny, a character must:
A. have a genetic basis. B. vary within a species. C. have only one state. D. show the same state across several species. E. All of the answer options are correct.
Which of the following organisms is part of the normal flora of the skin, nose, throat, and intestines of humans, and is also a leading cause of bacterial disease?
a. Propionibacterium acnes b. Corynebacterium diphtheriae c. Staphylococcus aureus d. Staphylococcus epidermidis
Which of the following statements is false?
a. Sensory receptors are structured to detect specific stimuli. b. Sensation is an awareness of a change in external or internal conditions. c. A stimulus will generate impulses that are different depending on where the signals are sent in the brain. d. Information about a stimulus is coded in the quantity and frequency of action potentials sent to the brain. e. Specific regions of the brain translate the information about the signal and convert it into a sensation.
During metaphase, chromosomes that are attached to microtubules are observed to undergo a "back-and-forth" movement. What is happening during this movement?
A) The centrosome is being replicated. B) The chromosomes are breaking up the nuclear membrane. C) The chromosomes are being aligned at the equator of the cell. D) The chromosomes are being replicated.